The Plant 2 project is expected to take nearly three years to complete. Work in the water will be conducted through mid-February, and start again in early August, when juvenile salmon are not migrating. To optimize the limited work schedule, dredging will occur around the clock. Signs, buoys and other navigational aids will be used to keep boats away from work zones.
According to the EPA, cleanup of the five early-action sites along the 5-mile (8-kilometer) industrial waterway will reduce health risks by nearly 50 percent. In early 2013, the EPA is expected to publish the proposed plan for cleaning up the entire Lower Duwamish Waterway.