Department of Ecology News Release - August 1, 2014

Partial cleanup proposed for Duwamish Waterway site
Crowley Marine Services site on Slip 4 under new ownership

SEATTLE – The new owner of a contaminated property along the Duwamish Waterway in Seattle will remove contaminated soil from part of the site under a proposed work plan and amendment to an existing legal agreement with the Washington Department of Ecology.

DeNovo Seattle LLC has purchased the 16-acre Crowley Marine Services 8th Avenue South site, which is undergoing an environmental investigation under a 2009 agreed order with Ecology. The company plans to construct a railroad spur as part of a project to unload barges that will be used in a nearby project to dredge contaminated sediments from the waterway.

Ecology seeks public comment on:

The cleanup, called an interim action, will occur only on the part of the property to be redeveloped for the rail spur. DeNovo will continue its ongoing site investigation, which is part of a process leading toward a final cleanup plan.

The property at 7400 8th Ave. S. has been leased for shipping container storage in recent years. Uses dating back to the 1920s include various manufacturing ventures that produced pipes, chains, lumber, treated poles, and aluminum windows. The land lies on the north bank of Slip 4, a short branch of the Duwamish Waterway near Georgetown.

Studies dating back to 1989 have detected that soil, groundwater and adjacent sediments in Slip 4 and the Waterway may contain arsenic, copper, polynuclear aromatic hydrocarbons (PAHs), and polychlorinated biphenyls (PCBs) in various combinations.

The site is located within the Lower Duwamish Waterway (LDW) cleanup site. The LDW site is a state-federal cleanup that covers about five miles of the Duwamish River south of Harbor Island. The LDW sediments are contaminated with several hazardous substances. Cleanup of the Crowley Marine Services site is part of a larger effort to control sources of pollution that can enter the waterway.

The proposed agreed order amendments and interim action work plan for the Crowley site are available at:

Comments on the order amendment and plan should be sent by Sept. 2, 2014, to Victoria Sutton, Ecology site manager, at:

For more background, please see Ecology’s Crowley site fact sheet.



Larry Altose, communications, 425-649-7009, @EcySeattle

Victoria Sutton, site manager, 425-649-7219