Last Updated: January 2023

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"Cleaning up: In-water cleanup moving forward at Seattle's iconic Gas Works Park"

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Response to Comments

Work continues on Sediment Unit Cleanup Action Plan

Ecology held a 30-day comment period (October 24 - November 22, 2022) and an online public meeting (November 2, 2022 presentation) on an environmental report and a legal agreement for the cleanup of the in-water Sediment Unit of the Gas Works Park site in Seattle.

The environmental report (remedial investigation and feasibility study) was prepared by the City of Seattle (City) and Puget Sound Energy (PSE) with Ecology oversight. It describes the areas requiring remediation, identifies and evaluates a range of cleanup action alternatives, and identifies a preferred alternative to address contamination.

The legal agreement (agreed order amendment) between Ecology, PSE and the City, requires development of a preliminary cleanup action plan based on the findings of the environmental report.

Ecology has reviewed and considered the public comments received on the documents. Based on Ecology’s evaluation of the comments, only an edit to the environmental report’s Figure 5-15 to include surface sediment screening data was necessary in the documents, and they are being finalized.

In 2023, Ecology plans to issue a cleanup action plan for public review. 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.

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