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MAY08 <br /> 195 <br /> ENVRONMENTAL HEALTH <br /> contaminated ground water is pumped through"aMIT/gpa�6-fugal 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 10o LEL level The clean treated water is <br /> discharged to the 31" 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 STATE'S REPORT #17 <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 6772 <br /> gallons of treated ground water dumped to the sewer as of <br /> January 25 , 1995 A continuous LEL reading of the - discharge <br /> water was observed and noted on the following table All <br /> discharge requirements were met <br /> No treated water was dumped to the sewer during the months of <br /> February, March, and April , 1995 Sampling of the ConVault <br /> treated water is scheduled for May 3 , 1995 , with discharge to the <br /> sewer scheduled after receipt of the DHS Certified Laboratory <br /> report <br /> Sincerely yours, <br /> George L Converse <br /> Pro]e 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 />