Terminal 4 Sediment Cleanup


Sediment Removal Action at Terminal 4 (T-4) is one part of an overall effort to clean up Portland Harbor, which was designated as a Superfund site in 2000. In 2003, the Port of Portland (Port) became the first party in Portland Harbor to sign an “early action” cleanup order with the U.S. Environmental Protection Agency (EPA). All cleanup activities at T-4 are designed to be consistent with the overall Portland Harbor Superfund site cleanup.

The Port worked closely with EPA to address and develop a plan to clean up known sediment contamination in the Willamette River at T-4 in North Portland. The entire cleanup plan for T-4 was approved and selected by the EPA in 2006. The selected cleanup plan included a combination of monitored natural recovery, capping, and dredging of contaminated sediments with placement of the contaminated sediment in a confined disposal facility to be built in Slip 1 at T-4.

In 2007, the EPA realigned the schedule of the Removal Action and split the selected remedy into two phases. The first phase was successfully completed in Fall 2008. During the Phase I work, the Port dredged approximately 12,800 cubic yards of contaminated sediment, stabilized and improved 850 linear feet of shoreline, and capped approximately 8,000 square feet of contaminated sediments. EPA approved completion of the Phase I work in 2009.

Current Status

EPA made another schedule realignment to T-4 cleanup efforts in 2010 to be consistent with the harbor-wide cleanup plan, anticipated to be issued by the EPA in 2015. Phase II of the Removal Action will be implemented after EPA issues the harbor-wide cleanup plan in the Record of Decision. The use of a CDF is dependent on the EPA’s Record of Decision for the entire Portland Harbor Superfund site.

The Port continues to monitor the cleanup work completed in 2008.

For more details about Phase I and II activities, click on the “Learn More” link in the sidebar. Visit the Phase 1 Photo Gallery, for images of Phase I work being completed.



Martha Richmond, Media Relations - 503.415.6061


Other Resources

Web sites
Portland Harbor Community Advisory Group Web Site
Oregon Department of Environmental Quality Web Site
U.S. Environmental Protection Agency Web Site



Terminal 4 Sediment Cleanup. Learn more.
View the photo gallery.

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