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Last Updated July 2023

2023 fact sheet

2023 Response to Comments

From June 20 – July 20, 2023, Ecology invited review of a cleanup action plan and associated documents for the cleanup of remaining contamination at the Gas Works Park site. The plan calls for removing and capping shoreline soil, treating shoreline groundwater, dredging sediment, capping sediment, monitoring, and administrative site use controls.

The plan is part of a legal agreement between Ecology, the City of Seattle (City), and Puget Sound Energy (PSE).

The following documents were available for review:

Cleanup Action Plan: describes Ecology’s selected cleanup action to address remaining contamination.
Consent Decree (legal agreement): requires the City and PSE to develop detailed design documents and construct the cleanup action described in the cleanup action plan.
State Environmental Policy Act-Determination of Non-Significance: Ecology determination that the cleanup action is not likely to have a significant adverse environmental impact.

Next Steps
Ecology has reviewed and considered the public comments received on the documents, and no edits to the documents are necessary. Ecology is finalizing the documents.

From 2023 – 2027, engineering design and permitting will continue, including additional investigations and evaluations to refine the cleanup action and enable detailed design work. Construction is planned to begin in 2027.