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R603 UPDATE-28 5/24/94 VAPOR RECOVERY OPERATIONS AND RESULTS As of April 26, 1994 , the REMOX units have operated for a total of 1.3756 hours out of a total of 20352 hours (68%-) . The new replacement operated 9754 hours out of 13699 hours (71t) . As of April 26, 1994 an estimated 73596 pounds of gasoline range hydrocarbons have been destroyed, see Tables 2, and 3 and Appendix D-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 present low of 9 . 9 pounds per day of gasoline range hydrocarbons on April 26, 1994 . Presently the system is destroying a range from 14 to 10 pounds per day of gasoline range hydrocarbons, see Table 2 . 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 an the 1000 gallon "ConVault" As of April 26, 1994 LTT had removed an estimated 5079 gallons of condensate/water and 26 25 gallons of product from the condensate traps . Total fluids removed as of April 26, 1994 5241 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 has reduced the hydrocarbons in ground water significantly since the May 25, 1990 sampling, see Table 1 Using benzene as an indicator, monitoring wells MW1, MW4 , MW5, MW6, MW7 and MW9 have been reduced to below detection limits while the wells being utilized for vapor extraction (MW2 , MW3 , and MW10) have been reduced by better than 990-. MW8 has been reduced by approximately 87k, since January 12, 1990 Of the newly installed wells MW11 and MW12, MW12 has shown a significant reduction in benzene concentration since the December 22 , 1993 sampling of 52t MW11 has always tested below detection limits . On December 22 , 1993 , a sample of the water being treated by air stripping inside the "ConVault" was obtained for certified laboratory analysis This was accomplished to prove the suitability for dumping the approximately 800 gallons of this cleaned water to the City of Stockton' s sanitary sewer, see Appendix B PAGE 3