Terminal 115 Cleanup
Where is the Site?                            Item No. 8e – attach 3
Meeting Date:June 11, 2024
The T-115 Plant 1 Site is located along the western shore of the Lower
Duwamish Waterway and consists of 94 acres owned by the Port of Seattle. 


Terminal 115

Terminal 115 Plant
Source: Department of Ecology
What is the cleanup goal?      What is the process?
Activities in this industrial corridor over many
decades have shaped the landscape we see today.         1. Study
Under an Agreed Order (AO) with the Department of
Ecology, the Port of Seattle and The Boeing
Company are conducting a Remedial Investigation                        Remedial Investigation
(RI), which will lead to a Cleanup Action Plan to                                 Feasibility Study               We are here
create a cleaner waterway.
2. Decide
What is the history of T-115?
Clean Up Action Plan
Terminal 115 has had many uses across the
decades. From 1917 to 1970 a portion of the
Terminal was the site of the Boeing Plant 1, Boeing’s        3. Act
first airplane facility where wood and metal airplanes
were manufactured. Other historic uses of the                                Clean Up the Site
property included retail gasoline service stations,                        Monitoring and Site Use Controls 
gravel and cement production, salvage yard, and                           Reviews and De-Listing 
storage of log booms. Today, the Site is a cold
storage plant for seafood and a container terminal.
What contaminants are expected to be found?
Metals (arsenic, lead, other)                             Petroleum (diesel, gasoline)
Polychlorinated biPhenyls (PCBs)
The Remedial Investigation will identify the
Volatile Organic Compounds (solvents, benzene)
exact contaminants.
Polycyclic Aromatic Hydrocarbons (PAHs)
In-language text with short link or QR code

     T-115 CLEAN UP TIMELINE 

Compile available
environmental data into a Data
Summary Report, identify data
gaps, and prepare a preliminary                          2021-22
Conceptual Site Model 
What is a
Prepare a Remedial                     Remedial
Investigation Work Plan (RIWP)
2022-23          to detail how environmental   Investigation?
media samples will be
collected and tested                   The goal of a Remedial
We are here     Investigation (RI) is to
collect soil, groundwater,
Complete the Remedial
and possibly soil gas quality
Investigation (RI) in                             2024
accordance with the                                                     data to understand the
approved RIWP                                               contaminants that exist,
Prepare RI report including          where they are located, and
results of environmental            how they move through the
sampling, presentation of type,      Site. The RI data will lead to
2025           nature, and extent of        developing cleanup
contamination, and risks posed           alternatives for the
by the contamination
contaminated parts of the
Prepare a Feasibility Study                                                                      Site. 
(FS) that identifies and
evaluates Remedial Actions                          2026
(i.e. “clean up actions”) for
areas of contamination 
Get in Touch
Hold public meeting and
comment period on the
Roy Kuroiwa, Port of Seattle
2027           combined Remedial
kuroiwa.r@portseattle.org
Investigation / Feasibility
Study                             Beau Johnson, Ecology Site Manager
BeJo461@ecy.wa.gov
Josh Bernthal, TRC
jbernthal@trccompanies.com
Prepare a Draft Clean Up
Action Plan (DCAP)                           2028
Terminal115.org

info@terminal115.org