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R603 SEWER 4 5-24-93 <br /> is then passed through a chamber containing an LEL meter relay <br /> calibrated to shut down the system if vapors from the effluent <br /> ever reach the 10% LEL level The clean treated water is <br /> discharged to the 3 " sewer clean out . Visual inspections for <br /> leaks on above ground lines, tanks and double contained system <br /> will occur during all site visits . <br /> UPDATE STATUS REPORT #4 <br /> Interim ground water treatment started December 1, 1992 LTT is <br /> vacuum lifting (purging) monitor wells MW1, MW2 , MW3 , MWS and <br /> MW10 twice a week Before the well purging commenced, water <br /> samples were obtained from the "ConVault" tank aerator before <br /> dumping 800 gallons of this treated water to the sewer lateral, <br /> see Update Status Report #1 The last dumping was for 985 <br /> gallons, making a total of 3672 gallons of treated ground water <br /> dumped to the sewer as of April 1, 1993 . A continuous LEL <br /> reading of the discharge water was observed and noted on the <br /> following table . All discharge requirements were met . <br /> No treated water was dumped to the sewer during the month of May, <br /> 1993 <br /> Sincerely your <br /> Georg Converse <br /> Pro]ect Manager <br /> cc Mr John Margowskz, Wickland Properties <br /> Ms Mary Meays, Public Health San Joaquin Cc <br /> i <br /> page 2 <br />