Item No. 8h supp
Meeting Date: September 9, 2025

East Waterway Superfund Site Remedial

Design Order and Memorandum of Agreement

with City of Seattle and King County

Presented by:
Brick Spangler - Sr. Env Program Manager
Joanna Florer- Sr. Manager Env Programs

Action Requested
Request Commission authorization for Executive Director to:
1. Sign and execute an EPA Administrative Settlement Agreement and
Order on Consent (Order) requiring the Port of Seattle, City of Seattle,
and King County to perform remedial design for the East Waterway
Operable Unit of the Harbor Island Superfund Site; and
2. Sign a Potential Responsible Party (PRP) Cost Sharing Agreement
between the Port of Seattle, City of Seattle, and King County to share
the costs to perform the scope of work required by EPA's Order
including EPA oversight costs.
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East Waterway Cleanup Location

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Project Description
Complete the Remedial Design with the City of
Seattle and King County for the cleanup of 121
acres of contaminated sediment in the 157acre East Waterway Superfund Site.

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Involved Parties
• Port of Seattle -The lead contracting agency for the cleanup
• East Waterway Group: Port of Seattle, City of Seattle, King
County will implement the cleanup with oversight from EPA
and will share costs
• EPA - Regula ng Agency

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Stakeholders
• Muckleshoot and Suquamish Tribes - usual and accustomed
fishing/harves ng area with treaty rights and is consulted by EPA
• Washington State Department of Natural Resources (DNR) - manager
of state-owned aqua c lands in EW
• Washington State Department of Ecology (Ecology) - provides input on
state cleanup rules and source control
• Non-Governmental Organizations (NGO) - Duwamish River
Community Coalition (DRCC) and other NGOs have been tracking and
commented on the cleanup process

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Costs, Funding and Schedule
• Estimated to cost $30 million
• Reimbursement by the City and County of 1/3 each.
(subject to reallocation)
• Funding in the 2025-2029 Environmental Remediation Liability
(ERL) Authorization.
Q3 - 2025
• Estimated Schedule: Commission Authorization of Order
Consultant designer procurement

Q2 2026

Remedial Design

2026-2031

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