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REG 603 UPDATE-8 7/17/92 • 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 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 June 22, 1992, with occasional auto shut downs due to high temperature (15500F) in pre-oxLdation chamber On March 10, 1992, adjustments were made to increase the pounds destroyed, and lower the natural gas and ambient air usage During these adjustments the pilot flame went out, indicating the need for maintenance to the pilot system. A REMOX service technician repaired the pilot system and the unit was restarted on March 15, 1992 At the present (June 22, 1992) the REMOX has operated for a total of 3686 hours out of a total of 5981 75 hours (62%) , removing and destroying 23700 pounds of gasoline range hydrocarbons for an average of 6.4 pounds per hour. Since the last update status report (March 18, 1992) the REMOX has operated 1075 hours out of a possible 2307.75 hours for a 46 6% operation and has removed/destroyed 7570 pounds or 7 0 pounds per hour, see Tables 2 and 3 and Appendix C-Air Monitoring Reports Condensate from vapor extraction is being collected in moisture drop out tanks constructed of 12" PVC pipe, prior to the manifold, to prevent moisture build up on the vacuum pump filter All fluids removed from the condensate traps are placed into the 1000 gallon "ConVault" within the treatment compound. As of June 22, 1992, a total of 10 27 gallons of product and 51 59 gallons of water have been removed from the condensate traps; 0 06 gallons product and 18 73 gallons water from EX4" , 3.98 gallons product and 13.13 gallons water from MW-10, and 6.23 gallons product and 21 73 gallons water from MW2/3 No fluids have collected in the MW-1 condensate trap As of June 22, 1992, a total of 3842 5 gallons of gasoline range hydrocarbons have been removed from the soil and ground water beneath this site with the condensate traps recovery, combined with previously removed floating product (40.25 gallons) and vapor extraction-destruction of hydrocarbons (23700 pounds/6.25 3792 gallons) No chlorinated solvents have been detected in chromatogram comparisons; ie 1,2,-Dichloroethane (DCE) - retention time 2 079 minutes, Trichloroethylene (TCE) - retention time 3.023 minutes and Tetrachloroethylene (PCE) - retention time 3 75 minutes. • PAGE 10