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9 <br /> I <br /> R603 SEWER 10 12-08-93 G <br /> i <br /> tank shrouded in concrete. The treatment of the ground water 3 <br /> a <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 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 /> 1 UPDATE STATUS REPORT #10 <br /> Interim ground water treatment started December 1, 1992 . LTT wasi <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 <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 reading of the <br /> 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 /> E <br /> Sincerely yours, <br /> Georg L. Converse <br /> Project Manager <br /> cc : Mr. John Margowski, .Wickland Properties <br /> Ms . Mary Meays, Public Health San Joaquin Co. <br /> i <br /> � l <br /> j3 <br /> 3 <br /> page 2 <br /> k !I <br />