Port of Port Townsend Stormwater Treatment Design

(Port Townsend, WA)  Located approximately 40 miles northwest of Seattle, the 20-acre Port of Port Townsend Boatyard is a well-known Puget Sound maritime center and home to numerous marine vessel repair and maintenance industry tenants. Landau Associates identified a potential Washington State Department of Ecology grant funding opportunity for the Port of Port Townsend and assisted the Port to prepare a Stormwater Improvements Work Plan for the Port’s boatyard stormwater retrofit grant application. The work plan was the basis of the successful grant application; the Port was awarded $371,000 in grant funding, or 75 percent of the project cost and ranked in the top 10 out of over 60 proposed projects.

Landau Associates provided engineering design of the stormwater treatment system funded by the grant. The system was installed in 2010 and is actively removing copper and zinc for NPDES Boatyard General Permit compliance. Ongoing services include assistance with Boatyard General Permit compliance. The project is the first known full-scale implementation of an advanced stormwater treatment technology for the removal of copper and zinc at a public boatyard in the United States. The treatment improvements have reduced copper levels in stormwater discharged from the boatyard into the adjacent Port Townsend Harbor by up to 94 percent.

The project was awarded an Engineering Excellence Award by the American Council of Engineering Companies (ACEC)—Washington.