Crowley Marine Services 8th Ave S
7400 8th Ave S, Seattle, WA 98108-3460

Approximate site boundary is in yellow. Click on the image to enlarge it.
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Ecology is reviewing the draft Remedial Investigation report (see below). 

As of September 2016, Waste Management has secured all the necessary permits to operate a transloading facility – loading contaminated soils and dredged sediments from trucks and barges onto rail cars. This facility is designated as temporary, because structures and equipment may need to be removed to allow site cleanup.

In 2009, Ecology entered into an Agreed Order with 8th Avenue Terminals (the Potentially Liable Person or PLP) to investigate and develop a cleanup action plan for the site. In 2014, an amendment to the Agreed Order added the new property owner, DeNovo Seattle LLC.

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 cleanup contamination and prevent recontamination of the sediment. [For some projects, such as this one, the RI and FS are combined into a single document called the RI/FS.]
  • 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 final draft of the RI/FS report is ready for review.

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 Crowley/DeNovo/8th Avenue 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.


The Crowley 8th Avenue site covers about 16 acres in an industrial area on the east side of the Lower Duwamish Waterway. To the southeast is EPA's Slip 4 Early Action Cleanup Area. The site includes a portion of the sediments in Slip 4. 

The site is bordered on the west by 8th Avenue South, with Georgetown’s only public river access point at the end of the street. It is bordered to the northeast by East Marginal Way S and to the northwest by other businesses. On the other side of East Marginal Way S is the residential neighborhood of Georgetown. 

Final site boundaries will be defined by the extent of contamination determined during the remedial investigation. 

The Lower Duwamish Waterway drainage basin is divided into source control areas. This site is located within the Slip 4 Early Action Area (river mile 2.8) source control area on the east bank of the river.


In the early 1900’s the site was residential. Between 1920 and 1985, activities on the site included:

  • Pipe and chain manufacturing,
  • Hydraulic equipment part manufacturing,
  • Sawmill, lumber yard, and creosote treatment
  • Concrete manufacturing
  • Machinery and scrap iron storage
  • Underground petroleum and gas storage

By 1985, all structures on the southern part of the site had been demolished, the site was paved, and there was a new dock for ships. The property was purchased by Crowley Marine Services in December 1992, and sold to 8th Avenue Terminals, Inc. in October 2008. It was leased to various tenants from 1992-2014.

In 2014, the property was sold to DeNovo Seattle LLC, who now leases it to Waste Management.


Contamination at this site is from heavy industrial use since the 1920’s. 

Soil contaminants include:

  • Metals such as arsenic and copper.
  • Polychlorinated biphenyls (PCBs).
  • Carcinogenic polycyclic aromatic hydrocarbons (cPAHs).

Groundwater contaminants include:

  • Metals such as arsenic and copper.
  • Carcinogenic polycyclic aromatic hydrocarbons (cPAHs).

Sediment contaminants include:

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


In July 2014 a State Environmental Policy Act (SEPA) and Model Toxics Control Act (MTCA) public comment period was held for an Interim Action (partial cleanup) Work Plan.
The Interim Action proposed removal of contaminated soil from an area to construct a concrete slab and rail lines.  During the SEPA Public Comment Period, Ecology received a letter from the Washington Department of Archaeology and Historic Preservation (DAHP) identifying the project area as having a very high potential for archaeological resources. 
Ecology determined that the SEPA review information provided by the property owner was not complete and withdrew the DNS.


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 1940187

Cleanup Site ID: 2520

Seattle, King County

Status: Cleanup Started   Get definitions of Status terminology

Victoria Sutton
Site Manager
(425) 649-7219

Amy White
Public Involvement Coordinator
(425) 649-7052

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008-5452