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Dept. of Ecology - Boeing Isaacson Thompson Cleanup Site

Available for public comment starting November 6, 2023!

Site Background:

The Boeing Isaacson Thompson cleanup site is located in an industrial area of Tukwila on the east bank of the Lower Duwamish Waterway (LDW). The cleanup site is comprised of two properties owned by The Boeing Company and one property owned by the Port of Seattle. The site is a former tidal marsh area which was reclaimed when the Duwamish River was straightened and channelized to form the current Duwamish Waterway in the early 1900s. After dredging, the area was used as farmland and then for a variety of industrial purposes. The former Duwamish River channel (later Slip 5) in the middle of the site was filled over time with contaminated materials from unknown sources.

More Information can be found here:

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