Facility Site ID: 21945598 Cleanup Site ID: 4146

Current Status

Approximate site boundary is in yellow.  Click on the image to enlarge it.
Approximate site boundary is in yellow. Click on the image to enlarge it.

Updated October 2020

The Feasibility Study phase is in progress. 

BACKGROUND 

In 2011, Ecology negotiated a legal agreement called an Agreed Order with property owners James and Jacqueline Gilmur, the Potentially Liable Persons (PLPs) for the Duwamish Marine Center site.

The Agreed Order describes the work that the PLPs agree to perform on the site. Under this legal agreement, the PLPs are required to complete the following: 

• Remedial Investigation (RI). The purpose of the RI is to define the nature and extent of contamination at the site and to determine if it is contributing to the sediment contamination in the Lower Duwamish Waterway. During the RI, the PLPs will collect data necessary to adequately characterize the contamination in soil, groundwater, stormwater, and sediments.

•Feasibility Study (FS). The FS will use the results of the RI to evaluate and choose measures to clean up contamination and prevent recontamination of the sediment.

•Draft Cleanup Action Plan (DCAP). Ecology will identify a preferred cleanup action based on the results of the FS.

To view site reports and fact sheets, click on the "View Electronic Documents" link to the right.


What happens next?

Ecology is working with the PLPs to complete the RI and move forward with the FS. The next opportunity for public comment will be when the Public Review Draft RI Report and Feasibility Study are ready for review.


Why this cleanup matters


This site is part of Ecology’s Lower Duwamish Waterway source control efforts, because it may be contributing pollution to 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 Duwamish Marine Center 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

The Duwamish Marine site is located in an industrial area on the east side of the Lower Duwamish Waterway. The site is bordered on the north by General Biodiesel, on the east by First Avenue South, on the south and west by the Duwamish River, and on the northwest by Slip 2.

The Lower Duwamish Waterway drainage basin is divided into source control areas. This site is located within the Slip 2 to Slip 3 (river mile 1.7-2.0) source control area along the east bank of the river.


Site history


Historically, the site operated as a marine shipyard, railyard, junk dealer, various construction service companies, and a barge shipping terminal.  A marine railway operated next to the southwestern shoreline from 1940 to the mid-1970s. 

Samson Tug and Barge operates in the northern portion of the Duwamish Marine Center. Duwamish Metal Fabricators operates on the southern portion of the property. 


Contamination

Contamination at the site is the result of heavy industrial use.

In the soil, contaminants of concern are:

•Petroleum hydrocarbonsMetals
•Polychlorinated biphenyls (PCBs)
•Carcinogenic polycyclic aromatic hydrocarbons (cPAHs)

In the groundwater, contaminants of concern are:

•Petroleum hydrocarbonsMetals, such as mercury.Polychlorinated biphenyls (PCBs)
•Carcinogenic polycyclic aromatic hydrocarbons (cPAHs)
•Volatile organic compounds (VOCs) 

In the sediments, contaminants of concern are:

•Polychlorinated biphenyls (PCBs)
•Carcinogenic polycyclic aromatic hydrocarbons (cPAHs)


Previous cleanup work

Several environmental investigations have been conducted at this site under the Voluntary Cleanup Program. In 2000 and 2002, soil and groundwater samples were collected from the site. Four groundwater monitoring wells were installed at the property in 2002. Groundwater was sampled in 2003 and 2004. 

In 2002, about 50 cubic yards of lead-contaminated soil classified as hazardous waste were excavated and removed from the central area of the site.  

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 1
Document Title Document Date Document Type
Duwamish Marine Center - Agreed Order 9/2/2011 Agreed Order
Public Information 2
Document Title Document Date Document Type
Duwamish Marine Center - Public Participation Plan 9/2/2011 Public Participation Plan
Duwamish Marine Center - Fact Sheet Comment Period for Agreed Order August 2011 7/18/2011 Fact Sheet\Public Notices
Technical Reports 14
Document Title Document Date Document Type
Duwamish Marine Center - Remedial Investigation 07) Appendices D - G 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 09) Appendix J 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 10) Appendices K - L 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 11) Attachments 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 06) Appendices A - C 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 04) Figures Part 3 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 03) Figures Part 2 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 02) Figures Part 1 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 05) Tables 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Remedial Investigation 01) Text 9/30/2020 Remedial Investigation Report
Duwamish Marine Center - Updates to Remedial Investigation Work Plan 1/15/2014 Remedial Investigation Work Plan
Duwamish Marine Center - Remedial Investigation/Feasibility Study Work Plan 5/13/2013 Remedial Investigation Work Plan
Duwamish Marine Center - Site Hazard Assessment 1/25/2012 Site Hazard Assessment Report
Duwamish Marine Center - Response to Status Request 4/28/2006 Site Specific Technical Document - other
Voluntary Cleanup Program 5
Document Title Document Date Document Type
Duwamish Marine Center - VCP Termination Letter 11/23/2009 VCP Administrative Document
Duwamish Marine Center - Opinion Letter 8/11/2009 Voluntary Cleanup Program Opinion – Other
Duwamish Marine Center - VCP Status Request Letter 6/16/2006 VCP Administrative Document
Duwamish Marine Center - VCP Technical Assistance on Site Closure 6/1/2005 VCP Technical Assistance
Duwamish Marine Center - VCP Application 5/7/2002 VCP Administrative Document
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Northwest Regional Office
    15700 Dayton Ave N
    Shoreline, 98133
    Please schedule an appointment to view print documents at this location.

Contaminants 7

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Other Contaminant - Base/Neutral/Acid Organics C
Metals - Metals Priority Pollutants C
Metals - Metals - Other C
Halogenated Organics - Polychlorinated biPhenyls (PCB) C
Non-Halogenated Organics - Petroleum Products-Unspecified C C
Non-Halogenated Organics - Non-Halogenated Solvents S C
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons C S
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.