Department of Ecology News Release - Aug. 26, 2019

Cleanup proposed for site on Duwamish Waterway

Comments sought; public meeting set for Sept. 12

The public can comment on an environmental cleanup plan for this industrial site along the Duwamish Waterway in Tukwila.


Property in Tukwila where past industrial activities contaminated soil and groundwater will undergo cleanup work, under a proposed work plan that’s available now for public comment.
Current and former owners of the 24-acre site along the Duwamish Waterway would carry out the plan, with oversight by the Washington Department of Ecology. 
The property, at  8801 East Marginal Way South, was home to truck and airplane manufacturing from 1929 through 2002. As part of the cleanup plan, contaminated groundwater would be treated and polluted soil would be removed. Once cleanup is complete, the property would be monitored to ensure it continues to meet state cleanup standards to protect public health and the environment.

Plans and reports available

Ecology, which oversees cleanup sites, is asking the public to review and comment on the proposed workplan, called an interim action, through Oct. 9, 2019. The agency is also seeking public comments on two reports – describing the site’s contamination and options for cleanup work – and a finding that the cleanup actions aren’t likely to harm the environment. These are available online (PDF files):

Cleanup work will be performed by PACCAR Inc., a former owner, and the property’s current owner, Centerpoint 8801 Marginal LLC. Centerpoint plans redevopment on the site. The cleanup would include:

  • Removing contaminated soil from six areas, including along the shoreline.

  • Inserting a soybean oil and bacteria mixture through wells to break down groundwater pollutants in a large area.

  • Treating other groundwater pollutants in a smaller area by inserting oxygen-rich compounds through wells.

  • Expanding an underground treatment system along the shoreline that vaporizes and removes pollutants in groundwater before it enters the waterway. 


History and contamination

Soil and groundwater studies show concentrations of metals, petroleum products, volatile and semi-volatile organic compounds, polycyclic aromatic hydrocarbons (PAHs), and polychlorinated biphenyls (PCBs) that exceed cleanup levels.  All of these contaminants are toxic.

Part of the Lower Duwamish Waterway cleanup

The cleanup at 8801 East Marginal Way South will contribute to the larger Lower Duwamish Waterway cleanup. Ecology and the U.S. Environmental Protection Agency jointly manage that effort along the approximately 5 miles of waterway upstream from Harbor Island. 

Cleanup and commenting information

Information about the site’s contamination and cleanup process is available at:

  • Ecology’s website.

  • Seattle Public Library South Park Branch, 8604 Eighth Ave. S.

  • Ecology’s Northwest Regional Office, 3190 160th Ave. S.E., Bellevue. By appointment: 425-649-7190. 

Comment by using Ecology’s online comment form. Or, submit comments or technical questions to Erin Hobbs, site manager, 426-649-7231, Department of Ecology, 3190 160th Ave. S.E., Bellevue WA, 98004-5452.

Public meeting

Ecology will host a community meeting to provide more information about the site and to take comments:

  • Thu., Sept. 12, 2019; 5:30 to 7:30 p.m.

  • South Seattle College – Georgetown Campus, Gene J. Colin Eduation Hall

  • 6737 Corson Ave. S.

Contact information

Larry Altose
425-649-7009 or
Twitter: ecyseattle
Erin Hobbs
Site manager
425-649-7231 or