ARCHIVED REPORTS XR0006569 - Laserfiche WebLink

Home Browse Search

R603 UPDATE-15 4/8/93 } } tedlar bag to obtain the sample to be injected into the PTD-GC and FID-GC. The lcc syringe is purged numerous times before filling it with the sample. All but 0 . 5 cc of the sample is ejected into the air before injecting the remaining 0 . 5 cc. ,j 'lsyringe sample into the chromatographs (the calibrant injection is 0 . 5 cc) . Once the chromatogram is recorded an instrument r blank is run prior to the next sample. The instrument blank indicates if residual peaks are being carried onto the next Panalysis . Prior to sampling an individual vapor stream, flow rates are recorded and vacuum influent readings are obtained from the wells ? by attaching a manometer calibrated in mm water to sample ports ` gat the well heads . These readings show the mm water pressure or vacuum that is being created at each well, see Appendix C - Field fNotes . E VAPOR RECOVERY OPERATIONS AND RESULTS F 3 JAs 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 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 , MW10 and the "ConVault" are used for vapor extraction for soil and ground water remediation. On October 10 , 1991 the vapor extraction system operated six hours, to check the auto shutdowns and percent destruction of the y REMOX unit, using monitor wells MW1, MW10, and the excavation swells . The system was restarted on October 17, 1991 and initial J inspection and operation of the system occurred. The unit operated until November 5, 1991, when it was shut down to replace k .a worn bearing. The system was restarted on November - 20, 1991 kk and operated until December 24 , 1991 . On this date . someone !i i turned off the main breaker that services the treatment compound. kThis breaker box has since been locked. The unit was restarted s on January 3 , 1992 and operated until July 20, 1992, with € p occasional auto shutdowns due to high temperature (15500F) in the E; pre-oxidation chamber. On July 20, 1992, - the heat exchanger S malfunctioned and the incinerator shut down due to low temperature.. The unit remained off until it was replaced on .; August 18, 1992 with a new unit . ,Presently (March 18, 1993) the REMOX units have operated for a s a total of 7567 hours out of a total of 11730 hours (64 . 51) . The < rt new replacement unit has operated 3565 hours out of 5083 hours (70%) , removing and destroying 63999 pounds of gasoline range ` hydrocarbons (March 11, 1993) and an estimated 45885 pounds of oxidized gasoline range hydrocarbons as CO2 (Average 200 cfm flow PAGE 6 i �k