Anacortes Port of Dakota Creek

A Puget Sound Initiative Site - Reaching the goal of a healthy, sustainable Puget Sound.

The Dakota Creek site is an active shipyard that is used for vessel construction and maintenance. Since around 1879, the Anacortes Port of Dakota Creek site has been used for maritime-related industrial activities like shipping, shipbuilding, repairs, bulk fuel storge, and vessel storage. These activities have resulted in soil, groundwater, and sediment contamination. Other potential sources of contamination at the site include previous outfall discharges from the former Scott Paper Mill and City of Anacortes municipal sewer prior to disconnection. Dakota Creek Industries (DCI) began leasing portions of the site from the Port beginning in 1976.

Before 2008, the marine area of the site featured multiple piers, docks, and marine railway boatlifts. One marine railway was removed in the early 1990s and the other was removed in 2008. This second railway removal was part of a redevelopment project that also took out two docks and dredged sediment from the waterway to make it deeper, reinforced the shoreline, and built a new pier. During this redevelopment an interim action cleanup was completed to remove around 26,000 cubic yards of contaminated marine sediment and upland soil from the marine area and land. Contaminants that remain at the site are located in upland soils and groundwater.

A Remedial Investigation/Feasibility Study (RI/FS) was performed in 2020 to describe the extent and nature of contamination at the site and present potential options for how to clean it up. Following the RI/FS, a Cleanup Action Plan was drafted, describing the final cleanup action work for the remaining contamination in the soil and groundwater at the site, and explains the requirements that the cleanup must meet. The final Cleanup Action Plan was competed July 2022.

In November 2022, an Engineering Design Report was completed which detailed the planned cleanup activities and schedule. Soil excavation and removal was completed between June and August 2023. Approximately 1,215 cubic yards of contaminated soil and asphalt/concrete debris was removed and replaced with clean soil.

The site is currently under one year of groundwater monitoring to determine the effectiveness of the excavation and disposal remedy. One year of monitoring will be completed in November 2024. Any contaminated soil that remains will be capped with pavement to prevent people and wildlife from encountering it. Long-term monitoring of the groundwater will then be put in place to ensure that contamination does not migrate offsite and create a risk of exposure.