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R603 SEWER 13 2-28-94 icontaminated ground water is pumped through a centrifugal pump and sprayed into a "ConVault" 1000 gallon above ground tank for spray aeration. The "ConVault" tank is a double contained steel tank shrouded in concrete. The treatment of the ground water will occur in batches (300 gallons per five hours) . After treatment the water is then dumped from the treatment tank, via the centrifugal pump through a totalizer water meter. The water is then passed through a chamber containing an LEL meter relay calibrated to shut down the system if vapors from the effluent ever reach the 10% LEL level . The clean treated water is discharged to the 3" sewer clean out. Visual inspections for leaks on above ground lines, tanks and double contained system will occur during all site visits. UPDATE STATUS REPORT #13 Interim ground water treatment started December 1, 1992 . LTT was vacuum lifting (purging) monitor wells MW1, MW2 , MW3 , MW8 and MW10 twice a week until May, 1993 , at that time the purging was reduced to once a week until discontinued on August 30, 1993 Before the well purging commenced, water samples were obtained from the "ConVault" tank aerator before dumping 800 gallons of this treated water to the sewer lateral, see Update Status Report #1 The last dumping was for 800 gallons, making a total of 5972 gallons of treated ground water dumped to the sewer as of January 3, 1993 (Discharge Report #7) . A continuous LEL reading of the discharge water was observed and noted on the following table. All discharge requirements were met . No treated water was dumped to the sewer during the months of September, October and November, 1993 , January, 1994 and February, 1994 Sincerely yours, George L. Converse Proj-ect Manager cc Mr John Margowski, Wickland Properties Ms . Mary Meays, Public Health San Joaquin Co. page 2