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f <br /> . previously removed floating product (40 25 gallons) , condensation <br /> from vapor extraction (48 75 gallons) , pro3ected petroleum <br /> hydrocarbon vapor extraction-destruction (74727 pounds/6 25 = <br /> 11956 3 gallons) and venting of MW8 (2 14 pounds/6 25 = 0 3 <br /> gallons) No chlorinated solvents were detected in chromatogram <br /> comparisons of the vapor (air) samples, "i e " 1 , 2 , - <br /> Dichloroethene (DCE) - retention time 2 079 minutes, <br /> Trichloroethylene (TCE) - retention time 3 023 minutes and <br /> Tetrachloroethylene (PCE) retention time 3 75 minutes <br /> In the past, water samples from MW1 and MW6 were tested using EPA <br /> method 8240 and were below detection limits for these compounds, <br /> see Update Status Report 21, September, 1993 Water samples <br /> obtained on March 4 , 1994 from MW1, MW6 , MW9 and MW11 were tested <br /> using EPA Method 8010 and were below detection limits for these <br /> compounds Water and vapor samples obtained from MW1 , MW6 and <br /> MW9 on April 19, 1995 , were tested using EPA Metod 8260 All <br /> priority compounds were below detection limits <br /> WEGE will be changing the BACT from Thermal Oxidation (REMOX <br /> unit) to vapor phase Carbon Adsorption, in light of the lower <br /> amount of hydrocarbons found in the vapor stream and the cost <br /> savings of utilities, versus carbon change-out This tentative <br /> modification to the BACT was approved by San Joaquin Valley <br /> Unified Air Pollution Control District on May 3 , 1995 Changing <br /> of the BACT should occur sometime in January or February, 1996 <br /> TIME FRAME <br /> January, 1996 Ground water gauging and vapor <br /> extraction system air monitoring <br /> HEALTH AND SAFETY <br /> i <br /> This site is being treated as a class D site, normal common sense <br /> is to be used <br /> 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 /> PAGE 6 R603 UPDATE-42 1/11/96 <br />