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Published on Sunday, Aug 19, 2007
These are the major toxic chemicals involved in the Copley Square Plaza contamination: Trichloroethylene (TCE). This probable cancer-causing agent is a colorless liquid with a sweet odor and sweet, burning taste. It's used primarily as a degreaser of metal parts and was widely used in automotive and metal-fabricating industries from the 1950s through the 1970s. The federal TCE limit in public drinking water supplies is 5 parts per billion; there is no limit for private wells. It was found at levels from 161 to 220 parts per billion in 1994 in Copley wells and as high as 810 parts per billion in 2003 tests of monitoring wells.
Tetrachloroethylene (PCE). This likely carcinogen has a sweet, sharp odor. It is widely used as a dry-cleaning fluid and a metal degreaser. The federal limit for public drinking supplies is 2 parts per billion; there is no limit for private wells. In Copley, PCE was found in 2003 tests of monitoring wells at levels as high as 36,000 parts per billion; in 1994 tests of residential wells, the highest levels were 570 parts per billion.
Vinyl chloride. This cancer-causing substance is typically a sweet-smelling colorless gas. It is used in the manufacture of polyvinyl chloride. It also is produced when bacteria break down TCE and PCE. It is a greater health threat than TCE or PCE. The federal limit for public drinking water supplies is 2 parts per billion. Levels in Copley monitoring wells in 2003 were as high as 27 parts per billion; the highest levels in residential wells in 1994 were 24 parts per billion.
1,2-Dichloroethane (DCE). This possible human carcinogen is believed to be a primary by-product of TCE and PCE. Federal limit in public drinking water is 7 parts per billion; there's no federal limit for private wells. It was found in Copley monitoring wells in 2003 at levels as high as 2,100 parts per billion and in 1994 in wells as high as 760 parts per billion. Bob Downing
These are the major toxic chemicals involved in the Copley Square Plaza contamination: Trichloroethylene (TCE). This probable cancer-causing agent is a colorless liquid with a sweet odor and sweet, burning taste. It's used primarily as a degreaser of metal parts and was widely used in automotive and metal-fabricating industries from the 1950s through the 1970s. The federal TCE limit in public drinking water supplies is 5 parts per billion; there is no limit for private wells. It was found at levels from 161 to 220 parts per billion in 1994 in Copley wells and as high as 810 parts per billion in 2003 tests of monitoring wells.
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