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r <br /> ` R603 SEWER 10 12-08-93 f <br /> I <br /> tank shrouded in concrete. The treatment of the ground water � <br /> will occur in batches (300 gallons per five hours) . After } <br /> treatment the water is then dumped from the treatment tank, via <br /> the centrifugal pump through a totalizer water meter. The water <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 10t 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 k <br /> will occur during all site visits. <br /> UPDATE STATUS REPORT #10 <br /> Interimround water <br /> g treatment started December 1 1992 <br /> LTT was ' <br /> vacuum lifting (purging) monitor wells MW1, MW2, MW3, MW8 and <br /> MW10 twice a week until May, 1993, at that time the purgeing was <br /> reduced to once a week until discontinued on August 30, 1993 . <br /> Before the well purging commenced, water samples were obtained <br /> from the "ConVault" tank aerator before dumping 800 gallons of <br /> this treated water to the sewer lateral, see Update Status Report k' <br /> #1 . The last dumping was for 700 gallons, making a total of 5172 <br /> gallons of treated ground water dumped to the sewer as of August <br /> 23, 1993 (Discharge Report #7) . A continuous LEL readingof the <br /> rll <br /> y discharge water was observed and noted on the following table. <br /> All discharge requirements were met . <br /> No treated water was dumped to the sewer during the months of <br /> September, October and November, 1993 . <br /> Sincer y yours, <br /> George L Converse <br /> Projec Manager <br /> cc : Mr. John Margowsk,i, . Wickland Properties <br /> Ms . Mary Meays, Public Health San Joaquin Co . <br /> t <br /> i <br /> _ I <br /> E <br /> page 2 <br />