Boeing Electronics Manufacturing Facility (EMF) Site | Region 10 | US EPA

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Boeing Electronics Manufacturing Facility (EMF) Site


The former Boeing Electronics Manufacturing Facility (EMF) is located at 7355 Perimeter Road South, in Seattle, Washington. The EMF site is located on the east side of King County International Airport (Boeing Field), approximately one half mile east of the Boeing Plant 2 site, and within the Lower Duwamish Waterway Superfund Site. EPA is investigating the EMF site to determine the extent of trichloroethylene (TCE) contamination of the groundwater and possible cleanup alternatives.

Environmental Engineering and Cost Analysis (EE/CA)

The EPA has released its Environmental Engineering and Cost Analysis (EE/CA) for Boeing EMF. The EE/CA is an evaluation of cleanup options for the site. The cleanup will address both the source of contamination and the groundwater plume. The EPA is considering five cleanup options in the EE/CA, including a “no action” alternative. With the exception of the "no action" alternative, the cleanup options will remove, treat or contain the TCE and vinyl chloride groundwater plume and the plume sources to prevent further contamination into the Lower Duwamish Waterway.

This evaluation is now available for public comment from July 25 to August 24, 2016. After the public review, the EPA will decide on a final cleanup plan later in an Action Memorandum, which will be based on the findings in the EE/CA.


The EMF was built by Boeing in the 1930s and was initially used for prototype aircraft assembly. It was reconfigured in the 1960s to manufacture electronic circuit boards using, among other things, solvent cleaning equipment including a vapor degreaser, underground solvent storage tank and associated supply piping.
Electronic circuit board manufacturing was discontinued in the late 1970s, and the associated vapor degreasing equipment was removed in the early 1980s. During the removal of this equipment, trichloroethene (TCE) contamination of groundwater underlying the EMF was discovered. The EMF buildings were demolished in 1996. Boeing previously worked to deal with the plume under the Washington State Department of Ecology’s (Ecology) Voluntary Cleanup Program. Groundwater treatment at the site has been ongoing since 1997.

The EMF plume contains significant concentrations of chlorinated volatile organic compounds (VOCs), mainly TCE, cis-1,2-dichloroethene (DCE), and vinyl chloride. The plume extends west and travels beneath the Boeing Plant 2 site and into the Duwamish River. The EMF plume may be mixing with other VOC groundwater plumes originating from the Boeing Plant 2 site. Boeing Plant 2 is the subject of an ongoing Resource Conservation and Recovery Act (RCRA) Corrective Action, under an Administrative Order on Consent issued to Boeing by EPA in 1994.
Air View of the Boeing EMF site. Click to enlarge.

Technical Information:
Laura Castrilli, Project Coordinator
Telephone: 206-553-4323

General Information:
Julie Congdon, Community Involvement Coordinator
Telephone: 206-553-2752

Fact Sheets
Stakeholder and Community Involvement Plan (PDF) (3 pp, 432K) - August 2008

Technical and Legal Documents

Environmental Engineering and Cost Analysis (EE/CA) (PDF) (103 pp, 3.2MB) - December 2015
EE/CA Administrative Record
Investigation Data Summary Report (PDF) (101 pp, 1MB) - November 2012
Data Gap Sampling Workplan (PDF) (77 pp, 446K) - September 2010
Data Gap Sampling Workplan QAPP (PDF) (45 pp, 410K) - September 2010
Data Gap Sampling Workplan Figures (PDF) (16 pp, 900K) - September 2010

Historical Data Summary Report - June 2008 (PDF) (116 pp, 868K) "Administrative Settlement Agreement and Order on Consent (ASAOC) for Removal Action" (PDF) (38 pp, 314K)
"Statement of Work (SOW)" (PDF) (11 pp, 69K)

Health Risks
Trichloroethylene (TCE)
Vinyl chloride
cis-1,2-dichloroethene (DCE)

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