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R603 UPDATE-20 9/15/93 VAPOR RECOVERY OPERATIONS AND RESULTS Presently (August 23 , 1993) the REMOX units have operated for a total of 10637 hours out of a total of 15523 hours (68 . 5k) . The new replacement unapt has operated 6635 hours out of 8876 hours (74 . 8'x) , removing and destroying and estimated 70728 pounds of gasoline range hydrocarbons and an estimated 64380 pounds of oxidized gasoline range hydrocarbons as CO2 (August 23 , 1993) for a total of 135108 pounds or 21617 gallons of gasoline range hydrocarbons removed from the subsurface, see Tables 2, and 3 and Appendix C-Air Monitoring Report . Since February 18, 1993 the vapor recovery/destruction has been declining from an average above 200 pounds per day of gasoline range hydrocarbons to a low of 30 pounds per day of gasoline range hydrocarbons on July 19, 1993 With the addition of the heat exchanger the pounds per day destruction was increased to nearly 70 pounds per day on August 23 , 1993 , dust prior to turning the system off for repair of the compressor, see Table 2 and concentration charts Figures 5A, 5B and 5C. These charts indicate that the heavier compounds of gasoline range hydrocarbons ethylbenzene, xylenes, etc . ) have been moderately reduced while lighter compounds (benzene, toluene, etc . ) have been greatly reduced. CONDENSATE REMOVAL BY LTT Condensation from vapor extraction is collected in moisture drop out tanks constructed of 12" 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 1000 gallon "ConVault" . Table 5 represents the field notes from LTT condensate removal, see Appendix B. As of August 30, 1993 LTT has removed an estimated 4915 gallons of condensate/water and 26 25 gallons of product from the condensate traps Total fluids removed as of July 27, 1993 5077 gallons of water/condensate and 48 75 gallons of product (162 previously recovered condensate water and 22 5 gallons of product) . 4 . 0 SUMMARY There has been no evidence of floating product or product sheen on the ground water in MW1 since April 14, 1992 and MW3 and MW10 since November 11, 1992 Only occasional product sheen is found with the condensate recovered from the vapor extraction moisture dropouts and manifold. Vapor recovery and well purging has reduced the hydrocarbons in ground water significantly since the May 25, 1990 sampling, see Table 1 Using benzene as an indicator, monitoring wells MW4, MW5, MW6, MW7 and MW9 have been reduced to below detection limits while the wells being utilized for vapor extraction (MW1 , MW3, and MW10) have been reduced by better than 99t . MW2 , which is also utilized for vapor extraction has been reduced 81% and MW8 has been reduced by approximately 22t . Of the newly installed wells MW11 and MW12, PAGE 3