Facility Site ID: 98422914 Cleanup Site ID: 11307

Current Status

Terminal 115 Plant 1 - aerial view
Terminal 115 Plant 1 - aerial view
Updated July 2020

Please note: the Northwest Regional Office, the document repository for this Site, is temporarily closed to the public.  Please access documents online through the links below.

Ecology negotiated a legal agreement called an Agreed Order with the Port of Seattle and the Boeing Company, the Potentially Liable Parties (PLPs) for the Terminal 115 Plant 1 Site (Site). The order requires them to investigate environmental conditions and develop a draft cleanup plan.

Ecology hosted a public comment period from April 27 - May 26, 2020 to get input on the Agreed Order and other documents for the Site. This comment period is now closed.

Ecology did not receive any comments that warranted significant changes to the documents, so they were finalized.  The Agreed Order was signed on July 6, 2020, and the cleanup process is now moving forward.




Agreed Order
 – requires the PLP to investigate contamination, complete a Remedial Investigation (RI), Feasibility Study (FS) and draft Cleanup Action Plan (dCAP) for the Site. 

Public Participation Plan – describes how Ecology will inform the community about Site activities and opportunities to be involved in the cleanup process. 






Fact sheets
Terminal 115 Plant 1 Fact sheet - English
Terminal 115 Plant 1 Fact sheet - Español
Terminal 115 Plant 1 Fact sheet - Tiếng Việt


Why this cleanup matters 

This site is part of Ecology’s Lower Duwamish Waterway source control efforts, because it is contributing pollution the Lower Duwamish Waterway (LDW) Superfund Site. The 5-mile stretch of the Duwamish River that flows north into Elliot Bay was added to the Superfund National Priorities List by the U.S. Environmental Protection Agency (EPA) in 2001. The sediments (mud) in the river contain a wide range of contaminants due to decades of industrial activity and runoff from urban areas. EPA is leading efforts to clean up the river sediments. Ecology is leading efforts to control sources of contamination from the surrounding land area. The long-term goal is to minimize recontamination of the river sediment and restore water quality in the river. The Site is one of several sites that will be cleaned up as part of Ecology’s Source Control Strategy – controlling sources of pollution to the river. Contaminants in the soil and groundwater around the river pose a risk to human health and the environment. They can also find their way into the river through storm runoff and other pathways. For more information, visit our Source Control page.

Site Information


Site location and history


The Site is located on the western shore of the Lower Duwamish Waterway, between Port
of Seattle N Terminal 115 and Glacier Northwest Inc. cleanup sites to the north and Highland Park Way SW to the south.  It occupies an area of approximately 99.5 acres and is owned by the Port of Seattle. 


 Between 1916 and 1970, a portion of the southern end of the site was the location of the former Boeing Plant 1 facility, used for the manufacture of wood and metal airplanes.  Other historic uses of the property included retail gasoline service stations, gravel and cement production, salvage yard, storage of log booms (former river portions), and a smelter. 


 Until approximately 1969, large areas of the Site were part of the waterway and were under water.  In 1969-1970, a large portion of the Site was filled to create usable land.


 Since then, the Site has been used for Port-related functions including cargo storage, loading and off-loading, gasoline sales and associated storage in underground storage tanks (USTs), seafood processing, retail sales and vehicle and shipping container maintenance.









 Contamination


Previous investigations at the Site found the following in soil and/or groundwater:

• Diesel range petroleum hydrocarbons
• Vinyl chloride
• Benzene
• Lead

All of these contaminants have been found at levels that exceed allowable standards under the state’s cleanup law, the Model Toxics Control Act (MTCA), and therefore must be addressed.


Previous investigations and cleanup work


Since 1990 several investigations have been conducted at the Site, primarily in response to
petroleum releases from former USTs. Investigations have also been done to evaluate catch basin solids, the presence of fill, and other former operations at the property. Sediment quality was also evaluated on the eastern portion of Terminal 115. Cleanup at the Site to date has included removal of visibly impacted soil and groundwater during removal of USTs.  In addition, free-phase petroleum was removed from extraction wells in the southwest portion of the Site.  The current Agreed Order may lead to additional cleanup.

General Cleanup Process

The Model Toxics Control Act (MTCA; Chapter 70.105D RCW is Washington’s environmental cleanup law). It provides requirements for contaminated site cleanup and sets standards that protect human health and the environment. Ecology enacts the MTCA and oversees cleanups. The MTCA site cleanup process is completed in steps (see graphic below) over a variable timeline.
Legal 4
Document Title Document Date Document Type
Agreed Order 18064 7/6/2020 Agreed Order
Terminal 115 Plant 1 - Agreed Order: Public Review Final Draft 4/2/2020 Agreed Order
Terminal 115 Plant 1 - Port of Seattle PLP letter 10/6/2015 Final Potentially Liable Person Status Letter
Terminal 115 Plant 1 - Boeing PLP determination letter 10/6/2015 Final Potentially Liable Person Status Letter
Public Information 4
Document Title Document Date Document Type
Terminal 115 Plant 1 - Factsheet: Vietnamese 4/22/2020 Fact Sheet\Public Notices
Terminal 115 Plant 1 - Factsheet: Spanish 4/22/2020 Fact Sheet\Public Notices
Terminal 115 Plant 1 - Factsheet: English 4/22/2020 Fact Sheet\Public Notices
Terminal 115 Plant 1 - Public Participation Plan: April 2020 4/2/2020 Public Participation Plan
Technical Reports 60
Document Title Document Date Document Type
Terminal 115 Plant 1 Parcel A - Memo: NFA at Initial Investigation 9/6/2023 Site Specific Administrative Document - other (Administrative correspondence)
Terminal 115 Plant 1 Parcel A - Initial Investigation Field Report 8/28/2023 Initial Investigation Report
Terminal 115 Plant 1 Parcel A - RI Report: West Duwamish CSO Control Project 8/18/2023 Remedial Investigation Report
Groundwater Monitoring - WFS Cardlock Facility 2/17/2021 Groundwater Monitoring Report
Stormwater Line Cleaning Report for POS Terminals 102, 103, 104, 106, 108, and 115 12/1/2015 Site Specific Technical Document - other
ERTS report 659944 10/7/2015 Site Specific Technical Document - other
Terminal 115 Plant 1 - SHA Rank Letter 7/1/2015 Site Specific Administrative Document - other (Administrative correspondence)
Terminal 115 Plant 1 - Site Hazard Assessment 6/8/2015 Site Hazard Assessment Report
Terminal 115 Plant 1 - SHA Notification Letter 12/5/2014 Site Specific Administrative Document - other (Administrative correspondence)
Site Assessment and Monitoring Report, T115 Southwest Tank Area 6/12/2012 Site Specific Technical Document - other
Phase I ESA & Preliminary Phase II 5/16/2011 Site Specific Technical Document - other
Terminal 115 Plant 1 - Environmental Conditions Report 4/6/2011 Site Specific Technical Document - other
LDW RI Report 7/9/2010 Remedial Investigation Report
Post-Dredge Subsurface Sediment Characterization and Sand Cover Monitoring Report 6/25/2010 Site Specific Technical Document - other
T115 Berth 1 Environmental Sampling and Compliance Monitoring, Recontamination Study for T115 Work Plan 3/1/2010 Site Specific Technical Document - other
Comprehensive Sediment Quality Summary Report for CSO Discharge Locations 12/1/2009 Site Specific Technical Document - other
Results of NWTPH-Dx and Dissolved Metals, T115 SW tank 10/23/2009 Site Specific Technical Document - other
POS T115 Slope Area Surface Sediment Char. Report 10/1/2009 Site Specific Technical Document - other
Sand Cover Monitoring Plan, POS T115 6/1/2009 Site Specific Technical Document - other
QAPP POS T115 Post-Dredge Subsurface Sediment Characterizaion 6/1/2009 Site Specific Technical Document - other
Memorandum Sediment Characterization Chemical Results Summary and Recommendations for Construction at POS T115 5/30/2008 Site Specific Technical Document - other
Toxic Equivalent Concentrations of TCDD in Source Sediments and Street Dirt 5/27/2008 Site Specific Technical Document - other
Phase I ESA & Limited Compliance Review 4/1/2008 Site Specific Technical Document - other
Outfall verification report 9/12/2007 Site Specific Technical Document - other
LDW Glacier Bay Source Control Area, Summary of Existing info and ID of Data Gaps 6/1/2007 Site Specific Technical Document - other
Stormwater Inspection Report 12/5/2006 Site Specific Technical Document - other
UST Removal, 6515 W Marginal Way SW 3/17/2006 Site Specific Technical Document - other
Site Investigation Report - First Ave S Bridge project 1/1/2004 Site Specific Technical Document - other
GW Compliance Monitoring, Former Diesel UST Location Parcel B at T115 2/10/2003 Site Specific Technical Document - other
VCP Site Closure REport, Former UST, Parcel B at Terminal 115 12/2/2002 Site Specific Technical Document - other
Historical Review Report - First Avenue South Bridge Exchange Properties 8/15/2002 Site Specific Technical Document - other
Harsh Ways, Edward W Heath and the Shipbuilding Trade 1/1/1999 Site Specific Technical Document - other
Results of Additional Monitoring and Extraction Well Installation, Wellhead Repair, High-Vacuum Extraction Pilot Testing, and hydrogen Peroxide Treatments 4/30/1998 Site Specific Technical Document - other
UST Site Assessment Report 4/13/1998 Site Specific Technical Document - other
checklist for Permanent Closure of UST for tank T-115D 11/15/1997 Site Specific Technical Document - other
Annual Report UST 1997 Compliance Monitoring Terminal 115 10/29/1997 Site Specific Technical Document - other
April 4, 1997 Groundwater Sampling Data, POS T115 4/23/1997 Groundwater Monitoring Report
Monitoring Well Installation, Soil, and Groundwater Sampling, POS T115 1/13/1997 Site Specific Technical Document - other
Letter Report documenting Removal of 600-gallon Fuel Oil UST 12/18/1996 Site Specific Technical Document - other
Soil Sampling, Port of Seattle, Terminal 115 9/5/1996 Site Specific Technical Document - other
Letter regarding Hand Auger Sampling POS T115 3/8/1996 Site Specific Technical Document - other
Foley Cardlock Facility Maps and tables 1/1/1996 Site Specific Technical Document - other
Summary of Product Recovery Operations 12/16/1995 Site Specific Technical Document - other
UST Closure Report, POS Terminal 115 9/21/1995 Site Specific Technical Document - other
Subsurface Investigation, POS T115 Property 7/2/1995 Site Specific Technical Document - other
Soil and Groundwater Assessment Report 2/21/1995 Site Specific Technical Document - other
UST Decommissioning and Soil Assessment Report, Terminal 115 2/12/1995 Site Specific Technical Document - other
Groundwater Assessment, Port of Seattle T115 8/4/1994 Site Specific Technical Document - other
Terminal 115 (Tank removal) 5/1/1993 Site Specific Technical Document - other
First Avenue South Bridge Haz Waste and Waste Discipline Report 6/1/1991 Site Specific Technical Document - other
UST Investigation in the vicinity of the Car Wash Building, T115 12/5/1990 Site Specific Technical Document - other
POS Record of Closure of UST 9983V 7/18/1989 Site Specific Technical Document - other
POS Record of Closure of UST 7848V 7/18/1989 Site Specific Technical Document - other
Letter EPA regarding Site Investigation Report at T115 7/15/1988 Site Specific Technical Document - other
POS letter regarding E&E T115 Site Inspection 12/3/1987 Site Specific Technical Document - other
Duwamish Ground Water Studies, Waste Disposal Practices and Dredge and Fill History 3/1/1985 Site Specific Technical Document - other
Potential Hazardous Waste Site Preliminary Assessment 11/27/1984 Site Specific Technical Document - other
Seattle Times Article 1971 4/11/1971 Site Specific Technical Document - other
An Investigation of Pollution in the Green-Duwamish River 6/21/1955 Site Specific Technical Document - other
Sources of Pollution in the Duwamish-Green River Drainage Area 12/6/1945 Site Specific Technical Document - other
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Contaminants 9

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals - Other S S
Halogenated Organics - Polychlorinated biPhenyls (PCB) S
Non-Halogenated Organics - Non-Halogenated Solvents C
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons S
Metals - Arsenic S
Metals - Lead C S
Non-Halogenated Organics - Benzene C C
Non-Halogenated Organics - Petroleum-Diesel C C
Non-Halogenated Organics - Petroleum-Gasoline C C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.