Template revised January 10, 2019.
COMMISSION
AGENDA MEMORANDUM Item No. 8f
ACTION ITEM Date of Meeting October 14, 2025
DATE: October 3, 2025
TO: Stephen P. Metruck, Executive Director
FROM: Arthur Kim, Capital Project Manager III, Waterfront Project Management
Stephanie Jones Stebbins, Managing Director, Maritime
SUBJECT: T18 Maintenance Dredging Additional ERL Funding
Amount of this request: $1,000,000
Total estimated project cost: $2,000,000
ACTION REQUESTED
Request Commission authorization for the Executive Director to increase the total costs not to
exceed from $1,000,000 to $2,000,000 for additional environmental remediation liability (ERL)
funding for upland disposal of additional contaminated sediment from the T18 Maintenance
Dredging Project, Master Identification No. N10746.
EXECUTIVE SUMMARY
Project budget authorization increase is requested to dispose of an additional 2,400 cubic yards
(CY) of contaminated sediment that is not suitable for open water disposal at an authorized
upland disposal facility. Regulatory agencies also require a 9” layer of clean sand over the
dredged areas.
JUSTIFICATION
Sediment testing conducted in 2025 determined that all dredged material for the NWSA T18
Maintenance Dredging Project was not suitable for open water disposal and must be disposed of
at an approved upland facility. Material unsuitable for open water disposal is classified as legacy
contamination and remains the responsibility of the homeport. At the time of initial construction
authorization, the project anticipated approximately 3,600 cubic yards of material requiring
upland disposal.
During the quality assurance and quality control (QA/QC) phase of final design, a miscalculation
of estimated dredge volume was identified by the consultant resulting in an increase of
unsuitable material to 6,000 total cubic yards. As a result of this increase of 2,400 cubic yards,
additional funding is required to complete the project. After all unsuitable material is removed,
regulatory agencies require the placement of a 9-inch clean sand layer over dredged areas.
COMMISSION AGENDA – Action Item No. 8f Page 2 of 4
Meeting Date: October 14, 2025
Template revised June 27, 2019 (Diversity in Contracting).
Due to the change in volume, we are requesting an additional $1,000,000 from the
Environmental Legacy Fund to fully fund the construction of the NWSA T18 Maintenance
Dredging Project (ELF).
Diversity in Contracting
Design is being developed by utilizing consultants on an existing IDIQ. Diversity in Contracting
Department will determine participation opportunities and appropriate aspirational goals for
WMBE in the construction phase of the project.
DETAILS
This is associated with the T18 Maintenance Dredging Project under the NWSA (N10204 with a
total NWSA authorization of $3,000,000). Because costs associated with legacy contaminated soil
are considered a Homeport responsibility per section 3.2(a) of the NWSA Charter, a separate
work project (N10746) was created for upland disposal work and is separate from the Northwest
Seaport Alliance T18 Maintenance Dredging Project. The costs of upland disposal will be booked
as operating expense to Port of Seattle Joint Venture as it is separate from the NWSA T18
Maintenance Dredging Expense Project.
Scope of Work
Additional construction funding is required to perform the following:
Take approximately an additional 2,400 CY of contaminated sediment that is not suitable
for open water disposal and dispose of it upland at an approved facility.
Place 9” of clean sand cover over the dredged areas as required by the regulatory
agencies.
Schedule
Commission construction authorization August 5, 2025
Construction start January 2025
In-use date February 15, 2025
Cost Breakdown This Request Total Project
Design $0 $0,000
Construction $1,000,000 $2,000,000
Total $1,000,000 $2,000,000
COMMISSION AGENDA – Action Item No. 8f Page 3 of 4
Meeting Date: October 14, 2025
Template revised June 27, 2019 (Diversity in Contracting).
ALTERNATIVES AND IMPLICATIONS CONSIDERED
Alternative 1 – Do nothing.
Cost Implications: No additional funds committed.
Pros:
(1) Reduced cost to the Port.
Cons:
(1) T18 Maintenance Dredging Project will not be fully completed and the lease obligations
to the Tenant cannot be fulfilled.
This is not the recommended alternative.
Alternative 2 – Fully fund the ERL portion of the T18 Maintenance Dredging Project.
Cost Implications: Additional funding of $1,000,000 to the project.
Pros:
(1) Complete the project according to the full committed scope of the T18 Maintenance
Dredging Project.
(2) Protects the environment from potential contamination at T18.
Cons:
(1) Additional funding of $1,000,000 is required.
This is the recommended alternative.
FINANCIAL IMPLICATIONS
Project Cost Details - NWSA
This Request Total Project Cost Cost to Date Remaining Cost
Procurement $0 $0 $0 $0
Pre-Design $0 $100,000 $100,000 $0
Design $0 $900,000 $450,000 $450,000
Construction $0 $2,000,000 $0 $2,000,000
Total $0 $3,000,000 $550,000 $2,450,000
Project Cost Details – POS ERL
This Request Total Project Cost Cost to Date Remaining Cost
Procurement $0 $0 $0 $0
Pre-Design $0 $0 $0 $0
Design $0 $0 $0 $0
Construction $1,000,000 $2,000,000 $0 $2,000,000
Total $1,000,000 $2,000,000 $0 $2,000,000
COMMISSION AGENDA – Action Item No. 8f Page 4 of 4
Meeting Date: October 14, 2025
Template revised June 27, 2019 (Diversity in Contracting).
Annual Budget Status and Source of Funds
The Port of Seattle’s Environmental Legacy Fund (ELF) will fund the project Fund.
Financial Analysis and Summary
Project cost for analysis $2,000,000
Business Unit (BU) Joint Venture
Effect on business performance
(NOI after depreciation)
N/A
IRR/NPV (if relevant) N/A
CPE Impact N/A
ATTACHMENTS TO THIS REQUEST
(1) Presentation slides
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS
August 5, 2025 – The Managing Members (POS only vote) authorized $1,000,000 in ERL for
construction.
August 5, 2025 – The Managing Members authorized $2,000,000 of NWSA funds for
construction.
April 21, 2023 – The Managing Members authorized $900,000 of NWSA funds for design.
February 2, 2023 – NWSA Executive Authorization of $100,000 approved for pre-design.
