News Posted August 27, 2008 Share Posted August 27, 2008 The dredging involved pumping 650 thousand cubic yards of sediment from the river and cleaning it because of contamination with polychlorinated biphenyls - or PCB's. That was caused by companies dumping untreated waste into the river years ago when the effects on the environment weren't fully appreciated. More... Link to comment Share on other sites More sharing options...
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