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R603 SEWER 11 1-04-94 <br /> a "ConVault"and sprayed into a ConVault 1000 gallon above ground tank for <br /> spray aeration. The "ConVault" tank is a double contained steel <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 10%s 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 #11 <br /> Interim ground water treatment started December 1, 1992 . LTT was <br /> vacuum lifting (purging) monitor wells MWI, MW2, MW3 , MW8 and <br /> MW10 twice a week until May, 1993, at that time the purging 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 800 gallons, making a total of 5972 <br /> gallons of treated ground water dumped to the sewer as of <br /> January 3 , 1993 (Discharge Report #7) . A continuous LEL reading <br /> of the discharge water was observed and noted on the following <br /> table . 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 /> Sincere y yours, <br /> George Converse <br /> Project Manager <br /> CC . Mr John Margowski, Wickland Properties <br /> Ms . Mary Meays, Public Health San Joaquin Co <br /> page 2 <br />