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water beneath this site The 12027 gallons included the <br /> previously removed floating product (40 25 gallons) , condensation <br /> from vapor extraction (48 75 gallons) , projected petroleum <br /> hydrocarbon vapor extraction-destruction (74612 pounds/6 25 = <br /> 11937 . 9 gallons) and venting of MW8 (1 . 58 pounds/6 25 = 0 25 <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 with laboratory results below detection limits for <br /> these compounds, see Update Status Report 21 , September, 1993 <br /> Water samples obtained on March 4 , 1994 from MW1, MW6 , MW9 and <br /> MW11 were tested using EPA Method 8010 and were below detection <br /> limits for these compounds Water and vapor samples obtained <br /> from MW1, MW6 and MW9 on April 19, 1995 , were tested using EPA <br /> Metod 8260 All priority compounds were below detection limits <br /> WEGE is also evaluating the need to change out BACT from Thermal <br /> Oxidation to Carbon Adsorbtion, in light of the lower amount of <br /> hydrocarbons found in the vapor stream and the cost savings of <br /> utilities, versus carbon change-out This tentative modification <br /> to the BACT was approved by San Joaquin Valley Unified Air <br /> Pollution Control District on May 3 , 1995 <br /> TIME FRAME <br /> September, 1995 Ground water gauging with quarterly <br /> monitoring well sampling <br /> HEALTH AND SAFETY <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 /> F Specifications supplied by "REMOX" for the Authority to <br /> PAGE 6 R603 UPDATE-40 8/29/95 <br />