Materials

Photo courtesy of the Port of Seattle

FAA’s Finding of No Significant Impact/Record of Decision (FONSI/ROD)

NOTICE IS HEREBY GIVEN that the Federal Aviation Administration (FAA) has approved a Final Environmental Assessment (EA) and a Finding of No Significant Impact/Record of Decision (FONSI/ROD) for the proposed Sustainable Airport Master Plan Near-Term Projects (NTPs) at the Seattle-Tacoma International Airport (SEA) in Seattle, WA.

The Port of Seattle (Port) is proposing 31 NTPs that improve the efficiency and safety of SEA, access to SEA, and support facilities for the airlines and SEA. The Proposed Action is illustrated on Exhibit 1-1 in the Final EA.

The Proposed Action includes:

A01 – Extension of parallel Taxiways A and B by approximately 1,800 feet.
A02 – Construction of Runway 16R/34L blast pads.
A03 – Taxiway C/D reconfiguration and Runway Incursion Mitigation (RIM).
A04 – Relocation of portion of Taxiway B to meet standards.
A05 – Construction of a north holding pad (approximately 90,000 square feet).
A06 – Construction of a new high-speed exit for Runway 34L arrivals between Taxiways J and E.
A07 – Taxiway D extension of approximately 500 from Runway 16C/34C west to Taxiway T.
A08 – North cargo hardstand construction (approximately 360,000 square feet).
A09 – Construction of a central hardstand (approximately 292,000 square feet).
A10 – Taxiway fillets construction.
T01 – Construction of a multi-level terminal concourse and aircraft apron (up to 19 gates).
T02 – Construction of an additional multi-level passenger terminal and parking garage.
C01 – Cargo 4 warehouse construction to replace Cargo 6 warehouse demolished for T01.
C02 – Construction of a cargo warehouse north of State Route (SR) 518.
C03 – Cargo warehouse construction north of SR 518.
L01 – Relocation of North Airport Expressway southbound lanes for the construction A09 and T01.
L02 – Elevated busway and stations at the Main Terminal, Second Terminal, and Rental Car Facility.
L03 – Construction of a loop ramp and split-level curbsides for the Second Terminal.
L04 – Northeast ground transportation center construction on north side of existing parking garage.
L05 – Relocation of the ground transportation holding lot displaced by L02 north of SR 518.
L07 – Construction of employee parking garage north of SR 518.
S01 – Fuel farm expansion (four new settling tanks and one blending tank).
S02 – Relocation of Aircraft Rescue and Firefighting Facility for construction of T01.
S03 – Construction of secondary ARFF facility.
S04 – Relocation of the fuel rack from Cargo 6 to Cargo 3 for construction of T01.
S05 – Triculator relocation to north cargo area for construction of A09.
S06 – Relocation of deicing tanks to a northern and southern location.
S07 – Construction of westside maintenance campus.
S08 – Airline support building construction in north cargo for construction of T01 and A08.
S09 – Expansion of the AMB/AFCO III building to replace displaced airline support facilities.
S10 – Construction of centralized receiving and distribution center north of SR 518.
Expansion of stormwater/industrial wastewater infrastructure.
Construction of stormwater management facilities and storm drainage vaults.
Installation of utilities (sewer, water, natural gas, fuel, and IT).
Central mechanical plant upgrades.

The FAA actions, determinations, and approvals necessary for this project to proceed include:

Unconditional approval of the Airport Layout Plan to depict those portions of the Proposed Action subject to FAA review and approval pursuant to 49 U.S.C. § 47107(a)(16)(B).
Approval and construction/relocation of FAA-owned equipment and associated infrastructure as well as any resulting flight procedures updates from the relocation of navigational aids.
Release of federal obligations to use property for non-aeronautical purposes, including any obligations under 49 U.S.C. § 47107, in accordance with FAA Order 5190.6B.
Approval of changes to the airport certification manual pursuant to 14 CFR Part 139.
Determination of project eligibility for Airport Improvement Program (AIP) funding and to impose Passenger Facility Charges in accordance with 49 U.S.C. §§ 47101-47144.

The Final EA and FONSI/ROD found that the project is consistent with existing environmental policies and objectives as set forth in the National Environmental Policy Act of 1969 and will not significantly affect the quality of the human environment.

Please note that the FAA’s environmental review is one step in a continuing effort to evaluate these 31 projects. The Port of Seattle will lead the State Environmental Policy Act (SEPA) environmental review of these proposed investments, with an expected public comment period in early 2026.

Copies of the FONSI/ROD and Final EA will be available for review at the following locations during regular business hours through November 25, 2025:

Seattle-Tacoma International Airport Office – Mezzanine Level above Checkpoint 2
17801 International Boulevard, SeaTac, WA 98158

Port of Seattle headquarters at Pier 69
2711 Alaskan Way, Seattle, WA 98121

Burien Library
400 SW 152nd Street, Burien, WA 98166

Des Moines Library
21620 11th Avenue S, Des Moines, WA 98198

Federal Way 320th Library
848 S 320th Street, Federal Way, WA 98003

SeaTac Valley View Library
17850 Military Road S, SeaTac, WA 98188

White Center Library
1409 SW 107th Street, Seattle, WA 98146

Tukwila Library
14380 Tukwila International Boulevard, Tukwila, WA 98168

Vashon Library
17210 Vashon Highway SW, Vashon, WA 98070

A facilitated webinar was held for the public on Wednesday, October 8, 2025. The virtual meeting can be found here (https://www.youtube.com/watch?v=lcCUHwiTR1M).

The Port Commissioners will be formally briefed at the next Commission meeting on Tuesday, October 14, 2025, at 12:00 p.m. at Pier 69 in Seattle, WA, with hybrid and in-person testimony available. The following meeting on October 28, 2025, will be at SEA with hybrid and in-person testimony available. Commission meeting information including instructions for providing public testimony, location and agendas can be accessed here. Future in-person and virtual open house meetings for public comment on the Port’s upcoming draft environmental impact statement are expected to occur in 2026.

Finding of No Significant Impact/Record of Decision (FONSI/ROD)

Federal Aviation Administration’s (FAA) Final National Environmental Policy Act (NEPA) Environmental Assessment (EA)

Main Body of Document

Cover, TOC, Errata, and Acronyms
Chapter 1 – Purpose and Need (Describes the background for the project, as well as the purpose and needs for the project)
Chapter 2 – Alternatives (Describes the process for identifying and evaluating alternatives for further consideration in the environmental review process)
Chapter 3 – Affected Environment (Describes the baseline conditions for each of the environmental resource categories)
Chapter 4 – Environmental Consequences (Describes the potential environmental effects, the significance of those effects, and proposed mitigation (where necessary), of the different alternatives for each environmental resource category)
Chapter 5 – Cumulative Impacts
Chapter 6 – List of Preparers
Chapter 7 – References

Appendices (Provide more detail on individual topics and the outreach)

FAA’s Draft NEPA Environmental Assessment (EA)

The FAA’s draft EA presents the purpose and need for the Proposed Action, analysis of reasonable alternatives, including the No Action Alternative, discussion of environmental impacts, and supporting appendices. For ease of access, the FAA’s draft EA document has been divided into the chapters and appendices listed below. It is recommended that the reader download each of these sections of the document to their computer rather than attempt opening the files directly from this website. If audio, visual, or language assistance are required with the FAA’s draft EA please leave a message at 206-339-0213.

Main Body of Document

Cover, Table of Contents, and Acronyms
Chapter 1 – Purpose and Need (Describes the background for the project, as well as the purpose and needs for the project)
Chapter 2 – Alternatives (Describes the process for identifying and evaluating alternatives for further consideration in the environmental review process)
Chapter 3 – Affected Environment (Describes the baseline conditions for each of the environmental resource categories)
Chapter 4 – Environmental Consequences (Describes the potential environmental effects, the significance of those effects, and proposed mitigation (where necessary), of the different alternatives for each environmental resource category)
Chapter 5 – Cumulative Impacts (Describes the cumulative impacts of the project and other past, present, and reasonably foreseeable future actions)
Chapter 6 – List of Preparers
Chapter 7 – References

Appendices (Provide more detail on individual topics and the outreach that has been conducted to date)

Additional Materials

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* Materials updated November 12 to reflect the FAA’s extension to the public comment period, making it a 53-day public comment period from October 21 to December 13, 2024.