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r R603 UPDATE-16 4/29/93 . 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, 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 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 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 , with 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 August 18 , 1992 with a new unit Presently (April 23 , 1993) the REMOX units have operated for a total of 8218 hours out of a total of 12596 . 75 hours (65 2%) The new replacement unit has operated 4216 hours out of 5949 . 75 hours (70 . 8%) , removing and destroying 66646 pounds of gasoline range hydrocarbons (April 23 , 1993) and an estimated 50541 pounds of oxidized gasoline range hydrocarbons as CO2 (Average 200 efm flow rate X average CO2% (1 . 25) x 8218 hours operated x 60 min/hour x pound C0-:� conversion 0 00041 lb/cf/%) for a total of 117187 pounds of gasoline range hydrocarbons removed from the subsurface, see Tables 2 , and 3 and Appendix A-Air Monitoring Report 4. 0 CONDENSATE REMOVAL AND WELL PURGING BY LTT Condensation from vapor extraction is collected in moisture drop out tanks constructed of 1.2 " PVC pipe, before the manifold, to prevent moisture build up on the vacuum pump filter. All fluids removed from the condensation traps are placed in the 1.000 gallon PAGE 6