"The U.S. Environmental Protection Agency says it will take 30 years and around $746 million to clean up a 10-mile stretch of the Willamette River known as the Portland Harbor Superfund Site.
The area from the Broadway Bridge to the Columbia Slough is highly contaminated from more than a century of industrial use. After 16 years of study, the EPA finally has a plan for how to clean it all up.
It starts with seven years of “construction” that includes dredging and covering more than 200 acres of the most contaminated soil at the bottom of the river. Some of the 1.8 million cubic yards of polluted sediment removed from the river would be stored in a confined disposal facility to be built in the river. The plan would also remove soil and cap highly contaminated areas along the banks of the river."