8801 E Marginal Way S
8801 E Marginal Way S, Tukwila, WA 98108

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Ecology is working with the current owners, CenterPoint Properties, and former owners PACCAR Inc. and Merrill Creek Holdings Inc. (collectively the Potentially Liable Parties or PLPs) to move forward with the formal cleanup process.

In 2008, Ecology entered into an Agreed Order with PACCAR Inc. and Merrill Creek Holdings Inc. to investigate contamination and develop a cleanup action plan for the upland area of 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 minimize recontamination of the sediment. 
  • Draft Interim Action Workplan (IAWP). Ecology will identify a preferred cleanup action based on the results of the FS.

In 2011, the PLPs submitted a final RI Report for the upland area that summarized past investigations, identified contaminants of concern, areas of concern and data gaps.

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 FS and move forward with a draft IAWP for the uplands. The next opportunity for public comment will be when the draft IAWP 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 8801 E Marginal Way 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.

Approximate site boundary is highlighted in yellow. Click on the image to enlarge it.
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This site is located in an industrial area on the east bank of the Lower Duwamish Waterway in Tukwila. It includes the upland area and the sediments in the Lower Duwamish Waterway next to the upland area. The upland area consists of about 25 acres of paved property, and about 1/4 of the property is covered by buildings.

The upland area is bordered to the north by the Boeing Isaacson Thompson cleanup site, and to the south by property owned by Container Properties, LLC (formerly the Rhone-Poulenc cleanup site) and the Museum of Flight Foundation. It is bordered to the west by East Marginal Way S and King County Regional Airport, and to the east by the Lower Duwamish Waterway.

The Lower Duwamish Waterway drainage basin is divided into source control areas. This site is located within the Slip 6 (river mile 3.9-4.3) source control area along the east bank of the river.


In 1929, Fisher Body Corporation built the main manufacturing building to assemble trucks. During World War II, Boeing used the facility to build airplane assemblies. In 1946 Kenworth Motor Truck Corporation, a PACCAR Inc (PACCAR) subsidiary, bought the property which is now the northern two thirds of the cleanup site.

In 1966, PACCAR bought what is now the southern third of the property from the Monsanto Company, which had operated a chemical manufacturing facility there. PACCAR built trucks on site from 1946 until 2002 when it decommissioned the facility.

Merrill Creek Holdings, LLC bought the entire property in 2004. Currently, the property is leased to Insurance Auto Auctions, Inc. which auctions damaged vehicles.

Centerpoint Properties purchased the site in 2015.


Contamination on the upland portion of this site is attributed to heavy industrial use since the 1920s. Soil or groundwater is contaminated with:

  • Petroleum hydrocarbons.
  • Polyaromatic hydrocarbons (PAHs).
  • Volatile and semi volatile organic compounds (VOCs and SVOCs).
  • Polychlorinated biphenyls (PCBs).
  • Metals (primarily chromium, copper, lead, nickel and zinc).


In the uplands, PACCAR completed several independent investigations and cleanup activities from 1986-2006. These included groundwater monitoring, studies of tidal influences, removal of soil and underground storage tanks, storm drain cleaning, and soil and groundwater sparging treatment to remove volatile organic compounds. Insurance Auto Auctions, Inc. also installed storm water quality improvements under a water quality permit.

In 2006, Ecology entered into an Agreed Order with PACCAR Inc. to investigate sediment contamination at the site. They submitted a Sediment Evaluation Data Report in 2009.


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 2072

Cleanup Site ID: 5056

Tukwila, King County

Status: Cleanup Started   Get definitions of Status terminology

Erin Hobbs
Site Manager
(425) 649-7231

Amy White
Public Involvement Coordinator
(425) 649-7052

Document Repositories:

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