The U.S. Environmental Protection Agency has unveiled 11 possible options for cleaning Seattle’s most polluted waterway, the Duwamish River.
The choices in the draft plan range in estimated cost from $220 million to $1.3 billion, and in duration from four years to more than four decades, The Seattle Times reported. They call for dredging and removing nearly 300 acres of toxic sediments, capping pollutants with rock, letting nature take its course, or some combination of all three.