Port of Seattle Terminal 10: From Superfund to Active Use

The Port of Seattle (Port) Terminal 10 (T-10), located on Harbor Island in Seattle, Washington, is a former Superfund site known as Lockheed Shipyard I, and spans the uplands operable unit and the Lockheed Shipyard Sediment Operable Unit (LSSOU) of the Harbor Island Superfund site. The Port proposed redevelopment of T-10, which required stormwater upgrades and controls for Superfund source control site requirements and protection of the LSSOU. The project was complicated by the Superfund remedies in place and had the potential to impact both the uplands and sediment caps. Coordination of the project with local, state, and federal agencies was instrumental to the successful completion of the project. Site redevelopment at T-10 improved nearly 11 acres of unused, vacant, Port-owned waterfront property to a condition supportive of active use. This transformation was possible due to early involvement and coordination throughout design between the Port, stakeholders, and the U.S. Environmental Protection Agency.