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contaminated ground water is pumped through a centrifugal pump <br /> 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 off the system if vapors from the effluent <br /> ever reach the loo 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 #18 <br /> Interim ground water treatment started December 1, 1992 . 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 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 7572 <br /> gallons of treated ground water dumped to the sewer as of May 31, <br /> 1995 . A continuous LEL reading of the discharge water was <br /> observed and noted on the following table All discharge <br /> requirements were met <br /> No treated water was dumped to the sewer during the months of <br /> February, March, April, and June, 1995 Sampling of the ConVault <br /> treated water occurred on May 17, 1995 with results received <br /> prior to the May 31, 1995, discharge <br /> Sincerely yours, <br /> George L Converse <br /> Pro3ec Manager <br /> CC. Mr John Margowski, Wickland Properties <br /> Ms Mary Meays, Public Health San Joaquin Co. <br /> page 2 R603 sewer discharge 217 <br />