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discharged to sewer on May 31, 1995 . Since that time there has <br /> been no additional discharge to sewer Also at this time a two <br /> hour-weekly bio-venting was initiated on MW-8 <br /> As of June 7, 1995 an estimated 12027 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 /> projected petroleum hydrocarbon vapor extraction-destruction <br /> (74612 pounds/6 25 = 11937 9 gallons) and venting of MW8 (1 14 <br /> pounds/6 25 = 0 18 gallons) No chlorinated solvents were <br /> detected in chromatogram comparisons of the vapor (air) samples, <br /> "i e 11 1 , 2 , -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 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 /> July, 1995 Monthly air sampling and ground <br /> water gauging Weekly venting of <br /> MW8 <br /> August, 1995 Monthly air sampling and ground <br /> water gauging, weekly venting of <br /> MW8 and modification of BACT <br /> September, 1995 Ground water 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 /> PAGE 6 R603 UPDATE-39 7/14/95 <br />