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
Item No. 8h supp
Meeting Date: September 9, 2025
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.
2
East Waterway Cleanup Location
3
Complete the Remedial Design with the City of
Seattle and King County for the cleanup of 121
acres of contaminated sediment in the 157-
acre East Waterway Superfund Site.
Project Description
4
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 – Regulang Agency
5
Stakeholders
• Muckleshoot and Suquamish Tribes – usual and accustomed
fishing/harvesng area with treaty rights and is consulted by EPA
• Washington State Department of Natural Resources (DNR) – manager
of state-owned aquac 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
6
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.
• Estimated Schedule:
7
Q3 – 2025Commission Authorization of Order
Q2 2026Consultant designer procurement
2026-2031Remedial Design
