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Boeing Fabrication Auburn Plant

Draft Remedial Investigation Report   en español

The Remedial Investigation (RI) identified the boundaries of the plume and the potential impacts of the contamination by evaluating data from groundwater, surface water, air and soil samples. The investigation also sampled Areas of Concern (AOCs) and Solid Waste Management Units (SWMUs) at the Facility for other contaminants, such as metals and petroleum. Under Ecology’s oversight, Boeing completed sampling and compiled a draft RI Report that summarizes the investigation’s findings and recommendations. Ecology reviewed and revised the draft RI Report.

Draft Remedial Investigation (RI) Report

The Draft RI Report uses the findings from the entire investigation to define the nature, extent, and magnitude of the contamination in order to identify the best methods for cleanup. For more information about the Draft RI Report you can:

Remedial Investigation Results

Ecology proposes to approve the RI as complete. Data collected during the RI sufficiently defines the area, concentrations and sources of contamination. Results from data collected during the RI do not indicate adverse health effects from occasionally touching or accidentally swallowing the contaminated water or breathing the air in areas above the contaminated groundwater. Investigation at the site focused on the four main topics listed below.


Ecology is recommending Boeing continue to evaluate site-wide groundwater and that it be further addressed in the FS.

Groundwater is water found underground that moves slowly through soil, sand and rocks. Ecology is considering a strategy that to clean up groundwater to state standards at locations across the site (referred to as a “site-wide strategy” in the draft RI Report), not just at specific locations where contamination was originally released. The original source areas for the contaminated groundwater plumes at the Facility do not indicate the need for additional source cleanup at this time. If contamination levels are above cleanup levels, Ecology will propose remediation or cleanup at those locations.

Please review the groundwater fact sheet for more information.

Surface water

Ecology is requiring surface water be protected to the same rigorous standards that are used for drinking water.

Boeing investigated ponds, streams, wetlands and stormwater ditches in Algona and Auburn. Hundreds of samples were collected and analyzed and do not indicate adverse health effects if people touch the surface water. Bodies of water include Government Canal, the stormwater collection ditch on Chicago Avenue, the O Street wetland, the Outlet Collection stormwater ponds and stormwater collection ditch, the Auburn 400 ponds, Mill Creek, and various wetlands associated with Mill Creek, including the Auburn Environmental Park.

No contaminants are presently detected in the public drinking water. Drinking water is provided by the City of Auburn public drinking water systems, which are monitored for contaminants. Private wells are not monitored like public drinking water. If you have a private well, please contact Ecology.

Please review the surface water fact sheet for more information.

Air quality (vapor intrusion)

Ecology is not recommending further indoor air evaluation, and indoor air will not be part of the FS because there are no indications of health risks.

Ecology has reviewed air quality data from samples taken in residential and commercial areas over contaminated groundwater, and the Department of Health has reviewed results from air sampling data. None of the data indicate human health risks from breathing air in these locations.

Please review the air quality fact sheet for more information.


Of the 31 SWMUs and AOCs at the Facility, Ecology will require Boeing to further evaluate four in the Feasibility Study (FS). Chemicals released may include low levels of petroleum hydrocarbons, cyanide and metals, such as cadmium and copper.

Please review the soil fact sheet for more information.

For findings from the project prior to the draft RI Report, please visit the Maps and Results page.