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R603 UPDATE-17 5/24/93 <br /> On April 1, 1993, a sample of the water being treated by air <br /> stripping inside the "ConVault" was obtained for certified <br /> laboratory analysis, before dumping approximately 985 gallons of <br /> this water to the City of Stockton' s sanitary sewer No water <br /> was dumped to the sanitary sewer during May, 1993, see Table 4 <br /> and Appendix B. <br /> As of May 18, 1993, a total of 19656 gallons of gasoline range <br /> hydrocarbons have been removed from the soil and ground water <br /> beneath this site. Previously removed floating product (40 25 <br /> gallons) , condensation from vapor extraction (48 75 gallons) , <br /> estimated petroleum hydrocarbon in situ oxidation CO2 vapor <br /> recovery (54347 pounds/6 25 pounds/gallon = 8695 5 gallons) and <br /> vapor extraction-destruction of hydrocarbons (67948 pounds/6 . 25 = <br /> 10871 . 7 gallons) . No chlorinated solvents were detected in <br /> chromatogram comparisons; "i e. " 1, 2, -Da-chloroethane (DCE) - <br /> retention time 2 . 079 minutes, Trichloroethylene (TCE) - retention <br /> time 3 023 minutes and Tetrachloroethylene (PCE) - retention <br /> time 3 . 75 minutes. <br /> 5 .0 TIME FRAME <br /> June 18 , 1993 Quarterly sampling and monthly site <br /> 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 /> PAGE 3 <br />