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k R603 UPDATE-23 1.2/27/93 the pilot/burner assembly. Presently the system is destroying an ' estimated 17 pounds per day of gasoline range hydrocarbons, see Table 2 . ` j CONDENSATE REMOVAL BY LTT I Condensation from vapor extraction is collected in moisture drop out tanks constructed of 121" FVC 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 29, 1 1993 LTT has removed an estimated 4995 gallons of condensate/water and 26 . 25 gallons of product from the condensate r i traps . Total fluids removed as of November 29, 1993 : 5157 I gallons of water/condensate and 48 . 75 gallons of product (162 previously recovered condensate water and 22 . 5 gallons of product) . i E 4.0 SUMMARY E There has been no evidence of floating product or product sheen an 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 I dropouts and manifold. Vapor recovery has reduced the hydrocarbons in ground water significantly since the May 25, 1990 f sampling, see Table 1. Using benzene as an indicator, monitoring ` wells MW4, MW5, MW6, MW7 and MW9 have been reduced to below i j detection limits while the wells being utilized for vapor " extraction (MW1, MW3, and MW10) have been reduced by better than 99`6. MW2, which is also utilized for vapor extraction has been reduced 810 and MW8 has been reduced by approximately 2216 . Of r the newlyinstalled wells MW11 and MW12 MW12 has not shown any y significant change in benzene concentrations and MW11 has always tested below detection limits . 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 11601 gallons of gasoline E range hydrocarbons have been removed from the soil and9 round water beneath this site. Previously removed floating product (40 . 25 gallons) , condensation from vapor extraction (48 . 75 gallons) , projected petroleum hydrocarbon vapor extraction- destruction (71951 pounds/6 . 25 = 11512 gallons) . No chlorinated p / g ) , ,I solvents were detected in chromatogram comparisons; "i .e. " 1, 2, - Dichloroethane (DCE) - retention time 2 . 079 minutes, Trichloroethylene (T CE) - retention time 3 . 023 minutes and E Tetrachloroethylene (PCE)PCE - retention time 3 . 75 minutes . Also water sampled from MW1 and MW6 were tested using EPA method 8240 G PAGE 3 ., 4