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• n pumped from the sediment trap with 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 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 10t 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 #23 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 800 gallons, making a total of 9071 . 7 gallons of treated groundwater dumped to the sewer as of February 20, 1996 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, and December, 1996 Sampling of the ConVault treated water occurred on January 31, 1996 with results received prior to the February 20, 1996 discharge Sincerely yours, Georg L Converse Pro ct Manager cc Mr John Margowski., Wickland Properties Ms Mary Meays, Public Health San Joaquin Co page 2 R603 sewer discharge 223