THE KELLOGG-DEERING WELL FIELD SUPERFUND SITE INCLUDES A 10 ACRE PUBLIC SUPPLY WELL FIELD ALONG THE WESTERN BANK OF THE NORWALK RIVER IN NORWALK, CONNECTICUT, AND AN UPGRADIENT SOURCE AREA LOCATED ON THE EAST BANK OF THE NORWALK RIVER. THE WELL FIELD IS OWNED AND OPERATED BY THE NORWALK FIRST TAXING DISTRICT WATER DEPARTMENT AND CONSISTS OF FOUR MUNICIPAL WATER SUPPLY WELLS THAT SUPPLY APPROXIMATELY FOR THE 45,000 RESIDENTS IN THE CITY OF NORWALK. TCE WAS FIRST DETECTED IN THE WELL FIELD DURING ROUTINE SAMPLING IN 1975. SINCE THAT TIME, OTHER CHEMICALS, INCLUDING TO 1,2 DICHLOROETHENE, METHYLENE CHLORIDE AND BENEZENE HAVE BEEN DETECTED. THE SITE WAS PLACED ON THE NATIONAL PRIORITIES LIST IN 1984. THE INITIAL RI/FS SUPPORTED THE FIRST OPERABLE UNIT RECORD OF DECISION ISSUED IN IN SEPTEMBER 1986. THIS ROD REQUIRED THE CONSTRUCTION AND OPERATION OF A NEW AIR STRIPPING FACILITY AT THE WELL FIELD. TO PROVIDE FURTHER INFORMATION REGARDING THE SOURCE AND EXTENT OF GROUNDWATER CONTAMINATION AT THE SITE, EPA BEGAN SUPPLEMENTAL RI/FS IN 1987. DURING THE SUPPLEMENTAL RI, EXTREMELY HIGH LEVELS OF TCE WERE FOUND IN THE AREA OF 270-280 MAIN AVE. ON THE EAST SIDE OF THE NORWALK RIVER. EPA ISSUED A RECORD OF DECISION FOR THE SECOND OPERABLE UNIT IN SEPTEMBER 1989. THE REMEDIAL ACTION REQUIRED BY THE