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Lower Duwamish Waterway
Source Control Investigation

8801 East Marginal Way South Site
(a.k.a. Kenworth Truck Co. Site)

Site Location

Site Background

The 8801 East Marginal Way South site is about 25 acres of paved property. About one quarter of the property is covered by buildings. This property is zoned for industrial activities.  In 1929, the main manufacturing building was built by Fisher Body Corporation.  During World War II, the property was used to produce trucks and airplane assemblies.  In 1946, PACCAR, Inc. purchased the property, and Kenworth Motor Truck Company continued truck manufacturing on this property until 2002.  In 1965, PACCAR annexed a portion of the neighboring property, the former Rhone-Poulenc and former Monsanto property.  In 2004, PACCAR sold the property to Merrill Creek Holdings LLC.  Insurance Auto Auctions, Inc. of Westchester, Illinois currently leases and uses the property.

Contamination

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

• Petroleum hydrocarbons.
• Poly-aromatic hydrocarbons (PAHs).
• Volatile and semi volatile organic compounds (VOCs).
• Polychlorinated biphenyls (PCBs).
• Metals (primarily arsenic, lead and copper).

Previous Work

In 2004 PACCAR, Inc. moved out of Ecology’s Voluntary Cleanup Program to negotiate a formal legal agreement with Ecology for site cleanup.  A sediment evaluation was needed to define the extent of contamination.  In 2006, Ecology and PACCAR, Inc. signed an Agreed Order to do a Sediment Evaluation Work Plan (SEWP).  PACCAR did several remediation tasks including groundwater monitoring, soil and underground storage tank removal and excavation, and soil and groundwater sparging treatment to remove volatile organic compounds. 

Agreed Order - 2008

Ecology is negotiating with PACCAR, Inc and Merrill Creek Holdings LLC, the potentially liable parties (PLPs) for a second Agreed Order to address the upland portion of the site.  Under this Agreed Order, the PLPs will do the following for the upland portion of the site:

• A Remedial Investigation/Feasibility Study (RI/FS).
• Data Gaps Report.
• Interim Action Work Plan for the proposed cleanup tasks.

The new Agreed Order will be available for public review later this year.  The Interim Action Work Plan with the RI/FS and Data Gaps Report will be available for public review and comment when they are complete.

Site Documents

• Fact Sheet -- August 24, 2006
• Public Participation Plan (141 kb)

Related Information

• More information on the Lower Duwamish Waterway
• Watershed Information WRIA #9

Additional Resources

• Glossary and acronyms used by the Toxic Cleanup Program
• Cleanup Process: Major Steps & Definitions
• Data Submittal Requirements for All Cleanup Sites
• Facility/Site Atlas
• Toxics Cleanup publications