http://www.poststar.com/articles/2009/09/12/news/local/doc4aabd963cbfad332215023.txt
reisman@poststar.com
FORT EDWARD -- Dredging of PCB-laden sediment has been halted on two spots of the Hudson River after a survey found heightened levels of the chemical at Thompson Island Dam.
Tests conducted over a 24-hour period between Thursday and Friday found the level of polychlorinated biphenyls to be about 526 parts per trillion, the U.S. Environmental Protection Agency announced late Friday.
The federal safety standard for water is 500 parts per trillion. A test showing the chemical level over the threshold triggers a temporary shutdown of dredging in some areas.
Dredging was shut down at the southern tip of Rogers Island in Fort Edward and about 2 miles south of the island.
Work on the Hudson River continues in other parts of the river, said Mark Behan, of Behan Communications and a spokesman for General Electric Co., the company that is funding the cleanup.
Additional water samples were taken on Saturday at the dam.
Behan said later Saturday that the tests found the PCB level to be lower. Work was planned to continue on the rest of dredging area of the river, he said. Dredging is not conducted on Sundays. Concerns over drinking water were raised before the project started, with officials in Halfmoon and Waterford arguing last year that an alternate water source is needed before the project could start.
The fear was that dredging could disperse more of the chemical downstream.
Residents in those communities now receive service from an alternative water source if tests find the level of PCBs to be more than 500 parts per trillion in river water.
Behan said officials in those towns were contacted by 4 p.m. Friday about PCBs exceeding the federal safety level.
EPA spokesman Michael McGowan wrote in an e-mail that the towns of Waterford and Halfmoon were notified in time to trigger an alternate water supply from Troy.
The long-delayed Fort Edward-based project to dredge the Hudson River sediment contaminated with PCBs, a chemical discharged by GE until the 1970s, started on May 15.
This is the third time since the cleanup started that work was disrupted by heightened levels of PCBs in the river.
In August, tests found PCBs crossed the 500 parts per trillion threshold twice — once on Aug. 1 and again on Aug. 7.
Dredging resumed the following week. At the time, EPA officials said the cleanup method was being adjusted to prevent further PCB dispersal down river.
Read more about this issue in The Post-Star on Sunday and online at www.poststar.com.

