 This was due to a 1974 leak of TCE from an underground 250-gallon concrete storage tank used by Commodore Business Machines in the semiconductor cleaning process.Leaks from tank had caused the local groundwater to become contaminated with trichloroethylene (TCE) and other volatile organic compounds (VOCs) in 1978.By 1999 GMT Microelectronics had $21 million in revenues and 183 employees working on the site.