residual contamination

Alcoa Will Dredge Columbia River for Toxic Sediments

Alcoa Will Dredge Columbia River for Toxic Sediments

OLYMPIA, Washington, December 10, 2007 (ENS) – The Washington State Department of Ecology Friday announced an agreement with Alcoa that has the aluminum giant cleaning up more than 95 percent of polluted sediments from the Columbia River next fall. The agreement will be finalized when the cleanup action plan, being developed this winter, is complete.…