Fox Ave Building
6900 Fox Ave S, Seattle, WA 98108

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Cleanup is underway.

In 2012, Ecology entered into an Agreed Order (legal agreement) with the current property owner, Fox Ave Building LLC, to require implementation of the Cleanup Action Plan. The Agreed Order was amended in 2013 to reflect new cleanup levels.


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The Fox Ave Building property is located in an industrial area on the east side of the Lower Duwamish Waterway. The Fox Avenue Building Site (Site) is defined by the extent of contamination at and migrating from the Fox Avenue Building property. The Site occupies an area of about 2.5 acres.

The Site is bordered to the north by South Willow Street, to the west by Fox Avenue South, to the south by the Whitehead Property (Historical Tyee Lumber Co.), and to the east by an empty lot known as “Lot 11” which is on East Marginal Way South. On the other side of East Marginal Way South is a residential neighborhood.

The Lower Duwamish Waterway drainage basin is divided into source control areas. This site is located within the Seattle Boiler Works to Slip 4 (river mile 2.3-2.8) source control area along the east bank of the river.


Seattle Chain and Manufacturing Company leased the property from King County, from 1918 until 1937 when it purchased the property. Seattle Chain and successor companies operated coke and oil fired furnaces and warehouses on the property.

For the next 20 years, ownership of the property changed hands several times. In 1956, Marian Properties LLC Enterprises bought the property and leased a portion of it to Great Western Chemical (GWC). GWC operated a chemical and petroleum repackaging and distribution facility on the property. GWC pumped bulk product through buried pipes as well as hoses on the surface. The facility had a number of underground and above ground storage tanks which stored chemical and petroleum products, including solvents, acids, and lube oils.

From the 1960s through the 1980s, GWC replaced and upgraded many of their warehouse structures. Several other companies leased parts of the property over the years. A number of chemicals and petroleum products were handled at the Site.

In 2003, Fox Avenue Building LLC bought the GWC property. Cascade Columbia Distribution now leases the property and uses the warehouse as a chemical distribution facility.

The groundwater from the Site reaches the Lower Duwamish Waterway, making it a concern for source control to prevent recontamination of the Lower Duwamish Waterway Superfund site.


Contamination at the site is the result of industrial use since 1918. The contaminants of concern in the soil and groundwater are:

  • Chlorinated solvents.
  • Petroleum hydrocarbons.
  • Semi-volatile organic compounds (SVOCs).
  • Dioxins and furans.


In 1989, Great Western Chemical (GWC) closed six underground storage tanks (USTs) in place which still remain under a concrete pad.  The same year, GWC also decommissioned ten other USTs, and removed these from the property in 1990.  As part of an overall remodel, GWC retained the services of Hart-Crowser to provide engineering assistance in the removal of the tanks.
In 1991, GWC entered into an Agreed Order with Ecology. Under this agreement, GWC agreed to do a Remedial Investigation/Feasibility Study. 

In 1993 GWC finished the Remedial Investigation and Preliminary Risk Assessment Report (RI/PRA).  More work was done following this report and summarized in a Supplemental Remedial Investigation and Feasibility Study report in 2000.  Previous investigations and cleanup work performed by GWC and Fox Avenue Building since 2000 include:

  • Soil and groundwater sampling.
  • Seep and soil vapor sampling.
  • Installation of groundwater monitoring wells.
  • Various other investigations to define the nature and extent of contamination.
  • Operation of a soil vapor extraction system
  • Pilot testing of various remediation technologies, including injections of chemical oxidants into groundwater.
  • Underground and above ground storage tank removals.

In 2009, Ecology entered into an Agreed Order with Fox Avenue Building requiring them to do the following:

  • Perform an interim cleanup measure to control the discharge of tetrachloroethylene (PCE) to the Lower Duwamish Waterway. This used Enhanced Reductive Dechlorination (ERD) to stimulate naturally-occurring bacteria to degrade contaminants.
  • Perform a pilot test to see how effective ERD may be in degrading contaminants in soils in the source area for the plume.
  • Do a source area data gap investigation to better identify the measures and cost needed to clean up this area.
  • Collect air samples to find whether PCE vapors are reaching the office part of the Fox Avenue Building facility. If so, evaluate restarting the existing soil vapor extraction (SVE) system to control vapor intrusion.
  • Do a Supplemental Feasibility Study to evaluate cleanup alternatives and enable Ecology to select a cleanup action that will achieve cleanup levels under state law within a reasonable time frame.
  • Prepare a draft Cleanup Action Plan (CAP) that documents the cleanup action selected by Ecology.


For a complete list of documents please see "View Electronic Documents" on the right.


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 2282

Cleanup Site ID: 5082

Seattle, King County

Status: Cleanup Started   Get definitions of Status terminology

Sunny Becker
Site Manager
(425) 649-7187

Amy White
Public Involvement Coordinator
(425) 649-7052

Document Repositories:

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