Site Description
Terminal 115 Plant 1 site (T-115) is in the industrial area along the western shore of the Lower Duwamish Waterway (LDW) at 6000 West Marginal Way SW, Seattle, Washington. T-115 comprises approximately 94 acres over two parcels owned by the Port. The property is leased by tenants who perform seafood processing, storage, and shipping; marine cargo shipping; and commercial vehicle fueling.
Site History
Historical industrial and commercial operations at the terminal began in the early 1900s. These activities included airplane production at the Former Boeing Plant 1 from 1917 to 1970; several historical and existing gas and service stations; releases from former underground storage tanks; gravel, concrete, and cement production; car wash operations; and extensive filling of historically submerged land.
Over the past century, the LDW shoreline was reshaped and realigned to better fit the needs of industrial tenants and maritime navigation. Sediment from these realignment projects was used to fill low spots and smaller channels at T-115, increasing the overall footprint and elevation of the terminal. The Port purchased the property in approximately 1970.
Contamination Issue
Past operations led to soil and groundwater contamination. Chemicals of potential concern will be identified during the remedial investigation study, which began in 2024. Early data collection indicates potential localized groundwater and soil contamination from petroleum hydrocarbons, volatile organic compounds, and metals.
What is the Port’s Role in this Cleanup?
As the current property owner, the Port leading efforts to address contamination at the Site along with The Boeing Company as a former owner and operator of the Site. The Port is performing a remedial investigation to support cleanup action, if needed, at T-115 Plant 1. This work is being performed under an Agreed Order between the Port, Boeing, and the Department of Ecology (Ecology).
T-115 Plant 1 is located along the LDW, which is a Superfund site with cleanup being led the U.S. Environmental Protection Agency, and is considered part of the Department of Ecology’s source control work.
Status
A Remedial Investigation Work Plan was approved by Ecology in February 2024. Site remedial investigation work commenced in June 2024 and will continue through 2026. Remedial Investigation and Feasibility Study activities and reporting are anticipated to take approximately three to four years.
Contact Information
Jalyn Buckley | Environmental Management Specialist | [email protected]
Additional Resources
Visit the project website and Ecology’s Terminal 115 Plant 1 Cleanup Site for more information.
