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r--Z aeration. The "ConVault" tank is ,a double contained steel tank shrouded in concrete The treatment of the groundwater 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 off the system if vapors from the effluent ever reach the 10% LEL level The clean treated water is discharged to the three inch 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 #25 ra Interim groundwater 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 1050 gallons, making a total of 10, 121 gallons of treated groundwater dumped to the sewer as of March 28, 1997 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 March, April , May, June, July, August, September, October, November, December, 1996 , and January, February, April and May, 1997 Sampling of the ConVault treated water occurred on March 18 , 1997 with results received prior to the March 28, 1997 discharge Sincer ly yours, Gear L Converse Pro ect Manager cc Mr John Margowski, Wickland Properties Ms Mary Meays, Public Health San Joaquin Co a page 2 R603 sewer discharge 25