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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 10* LEL level The clean treated water is <br /> discharged to the 311 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 ##20 <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 700 gallons, making a total of 8272 <br /> gallons of treated ground water dumped to the sewer as of October <br /> 11 , 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, June, July, August, September, November <br /> and December, 1995 <br /> Sampling of the ConVault treated water occurred on September 28, <br /> 1995 with results received prior to the October 11 , 1995, <br /> discharge <br /> Sincere yours, <br /> George Converse <br /> Qrn-I rr Marager <br /> cc - Mr John Margowski , Wickland Properties <br /> Ms Mary Meays, Public Health San Joaquin Co <br /> page 2 R603 sewer discharge 220 <br />