Washington State Department of Ecology - April 29, 2013

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Interim cleanup proposed at South Park Landfill site; public comment sought

BELLEVUE – The current owners of part of the former South Park Landfill site in Seattle plan an interim environmental cleanup under a proposed amendment to a legal agreement with the Washington Department of Ecology (Ecology). 

The city of Seattle – which once operated the landfill – and South Park Property Development LLC (SPPD) – the current owner of part of the site – plan the interim cleanup on 19 acres of the 40-acre contaminated site.  The rest of the site is under separate ownership. 

Ecology seeks public comment on the amendment, which would modify a 2009 “agreed order” that defines the process for studying the site’s contamination and proposing cleanup options.  The planned partial cleanup under the proposed amendment would be an “interim action” under the state’s toxic site cleanup law.  The overall investigation and planning for a final cleanup would continue.

As part of an environmental review under the State Environmental Policy Act (SEPA), Ecology determined the proposed actions would not have a significant negative impact to the environment.  The SEPA Determination of Non-Significance (DNS) and checklist are both available for public comment.

The agreed order amendment, SEPA documents, and other information about the South Park Landfill site are available at:

Ecology will accept comments through May 30, 2013. People with comments or questions should send them to Jerome Cruz, Department of Ecology, 3190 160th Ave. SE, Bellevue WA 98008 or jerome.cruz@ecy.wa.gov. For questions by phone, please call 425-649-7094.

The proposed interim cleanup project has four parts:

The property – in the 8100-8200 blocks of Second Avenue South – is the site of a municipal waste landfill, which was operated by the city of Seattle on King County-owned property.  The landfill stopped accepting waste in 1966 when Seattle opened its South Transfer and Recycling Station.  The landfill site, as currently known, includes the city’s station, property owned by SPPD and part of the Kenyon Business Park. 

An auto-wrecking yard and truck storage facilities have also used parts of the property.

Environmental studies performed at the site have detected groundwater contamination from arsenic, iron, manganese, vinyl chloride and possibly dichloroethene and benzene.  Contaminants of potential concern for soil include arsenic, lead, diesel and oil. Landfill gas – methane and carbon dioxide – also is present at the site.

Cleanup of the South Park Landfill site, located about 1,500 feet from the Lower Duwamish Waterway, contributes to a larger effort to control sources of contamination to sediments in the waterway.  Ecology and EPA jointly oversee the Lower Duwamish Waterway cleanup site, approximately five miles of waterway upstream from Harbor Island.  For more information about the overall Lower Duwamish cleanup is online.

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Media Contacts:

For more information:

South Park Landfill cleanup (https://fortress.wa.gov/ecy/gsp/Sitepage.aspx?csid=1324)

Lower Duwamish Waterway cleanup (www.ecy.wa.gov/programs/tcp/sites_brochure/lower_duwamish/lower_duwamish_hp.html)

Ecology’s social media (www.ecy.wa.gov/about/newmedia.html)