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R603 UPDATE-22 11/11/93 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 , just prior to turning the system off for repair of the compressor and changing out the pilot/burner assembly. Presently the system is destroying 30 to 40 pounds per day of gasoline range hydrocarbons, see Table 2 and concentration charts Figures 5A, 5B, 5C, 5D, 5E and 5F. 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/water removal, see Appendix B. As of November 5, 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 August 30, 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 99%s MW2 , which is also utilized for vapor extraction has been reduced 81's and MW8 has been reduced by approximately 22%s Of the newly installed wells MW11 and MW12 , MW12 has not shown any significant change in benzene U V1 .ClH.«Gt1V1s al-LA M.71"1 116.10 -1 r%QYO 1'69F46ct, on � 'e . re1A.J1 " L lm *n 11LLL 1..0 On August 23 , 1993 , a sample of the water being treated by air stripping inside the "ConVault" was obtained for certified laboratory analysis, before dumping the approximately 700 gallons of this cleaned water to the City of Stockton' s sanitary sewer, see Appendix A. As of November 5, 1993 , an estimated 21887 gallons of gasoline range hydrocarbons have been removed from the soil and ground water beneath this site . Previously removed floating product (40 25 gallons) , condensation from vapor extraction (46 75 PAGE 3