ARCHIVED REPORTS XR0006515 - Laserfiche WebLink

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If evaluations indicate that a continuous groundwater pumping system is needed, selected weI be connected to the "ConVault" treatment system Is will Groundwater recovery lines, from the wells to the treatment compound, will be 3/8" nylon to inside buried 3" PVC pipe, for double containment considerations y bjng The groundwater recovery lines wiII be plumbed to an above ground polyethylene sediment The contaminated groundwater ns pumped from the sediment trap with a centrafu al um The sprayed into a "ConVault" 1000 gallon above ground tank for spray aeration The "ConVault" an 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 clears treated water is discharged to the three-inc sewer clean out A visual inspection for leaks on above ground lines, tanks and double system will occur during all site visits contained UPDATE STATUS REPORT#31 Interim groundwater treatment started December 1, 1992 monitor wells MWI, MW2, MW3, MWS and MWI0 twice a week until May 1993, at tLTT was vacuum hat ttme�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 1000 gallons, making a total of 16,022 gallons ogf treated roundw dumped to the server as of April 15, 1998 A continuous LEL reading of the discharge water wer observed and noted on the following table All discharge requirements were met as 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, May, Jul August, September 1997 and March 1998 Sampling of the ConVault treated w April 14, 1998 with results received April 28, 1998 iter occurred on Y' Y, 2 R-603 WW#3I 4/29/98