Cleaning up Trinity River's PCBs "may take decades"
Environmental Issues - February 5, 2010
The Dallas Morning News reports that fish in the Trinity River in North Texas won't be safe to eat until the river's levels of PCBs come down by more than half, according toa recent state study.
The report said the just writing a plan for the Trinity's PCB pollution could take two years. And in the end, the only answer may be to wait for nature to break down the stubborn chemicals – a process that might take decades.
According to the state environmental commission's new study, the amount of PCBs in different parts of the river would have to drop by at least 60 per cent – and in some spots by as much 86 per cent – before fish would again be safe for human consumption.
The study by Parsons Corp, a consulting firm, showed how difficult achieving those reductions might be. F
The study found that nearly two-thirds of the Trinity's continuing loads of PCBs comes from the river's sediments. PCBs enter the river and bind to the bottom soil, recontaminating the water when floods stir up the sediment.
Dredging the sediment could be on the table when regional representatives assemble to discuss options.
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