During the time Cornell-Dubilier was operating at the site, the company tested and dumped transformer oils and also transformers, both of which contained PCB's, among other chemicals, including TCE.
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1986: Site inspection reveals PCB's in soil.
1994-1996: PCB's and other chemicals are determined to have contaminated water, sediment, and soil outside the site.
1997: Cleanup finally begins. Site is paved over. EPA cleans homes near site and treats soil near site. Many businesses near the site are relocated.
2000+: ongoing operations to clean up site continue.