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R603 UPDATE-20 9/15/93 <br /> MW12 has not shown any significant change in benzene <br /> concentrations and MW11 has always tested below detection limits . <br /> On August 23 , 1993 , a sample of the water being treated by air <br /> stripping inside the "ConVault" was obtained for certified <br /> laboratory analysis, before dumping the approximately 700 gallons <br /> of this cleaned water to the City of Stockton' s sanitary sewer, <br /> see Appendix A. <br /> As of August 23 , 1993, an estimated 21706 gallons of gasoline <br /> range hydrocarbons have been removed from the soil and ground <br /> water beneath this site . Previously removed floating product <br /> (40 . 25 gallons) , condensation from vapor extraction (48 . 75 <br /> gallons) , projected petroleum hydrocarbon in situ oxidation CO2 <br /> vapor recovery and vapor extraction-destruction of hydrocarbons <br /> (135108 pounds/6 . 25 = 21617 gallons) . No chlorinated solvents <br /> were detected in chromatogram comparisons; "i .e . " 1, 2 , -- <br /> Dichloroethane (DCE) - retention time 2 . 079 minutes, <br /> Trichloroethylene (TCE) - retention time 3 . 023 minutes and <br /> Tetrachloroethylene (PCE) - retention time 3 . 75 minutes . <br /> 5.0 TIME FRAME <br /> September 21, 1993 Quarterly ground water sampling and <br /> monthly site monitoring. <br /> 6 .0 HEALTH AND SAFETY <br /> This site is being treated as a class D site, normal common sense <br /> is to be used <br /> 7 .0 LIMITATIONS <br /> The conclusion and recommendations presented in this report are <br /> based upon the following: <br /> A. The exploratory test borings drilled at the site . <br /> B The Bouwer and Rice Slug test . <br /> C. The Vapor Extraction Source Test <br /> D. The observations of field personnel <br /> E . The results of laboratory analysis performed by a state <br /> certified laboratory <br /> E. Referenced documents . <br /> F. Specifications supplied by "REMOX" for the Authority to <br /> Construct Permit . <br /> G Our understanding of the regulations of the State of <br /> California, San Joaquin County and City of Stockton <br /> The services performed by Western Geo-Engineers, a corporation <br /> under California Registered Geologist #3037 and/or Contractors <br /> License # 513857, have been conducted in a manner consistent with <br /> PAGE 4 <br />