Item No: 11a supp Meeting date: October 14, 2025 Sustainable Airport Master Plan Near-Term Projects Update Arif Ghouse, Interim Aviation Managing Director Steve Rybolt, Senior Environmental Program Manager FAA Completes Environmental Assessment • This is an important milestone in an ongoing process to evaluate the environmental impacts of the 31 proposed SAMP projects. • The FAA has released their NEPA Final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) Record of Decision (ROD). It found that completing these projects would have no significant impact. • Today's presentation will describe: 1) why the Port is planning for future demand 2) what the 31 projects are 3) the FAA's NEPA findings 4) next steps, including a Port-led environmental review, public engagement, and future Port process. 2 Regional Growth Drives Air Travel Demand at SEA 3 Our Compact Footprint A Constrained Footprint Seattle Burien Normandy Park Des Moines Federal Way SeaTac Tukwila 4 SEA Does More with Less: Contrast to ATL 5 SAMP NTPs Aim to Address Airport Congestion and Delay Crowded Drives Airfield Congestion and Delays Busy Security Lines Congested Passenger Areas 6 Early Work Evaluated Many Options To Address Needs 7 The Result Was Our Proposed 31 Near-Term Projects 8 SAMP NTPs Address Airfield, Landside and Terminal Needs Westside Maintenance Campus Runway Blast Pad Runway Blast Pad Taxiway D Extension Highspeed Exit ARFF Relocation Taxiway A/B Extension North Gates C4S Warehouse Redevelopment Centralized Receiving and Distribution Facility Hardstand - North Hardstand - Central Fuel Farm Expansion Off-site Cargo Ground Transportation Center Roadway Improvements Second Terminal Airline Support 9 Once Planning Was Completed, Environmental Review Began Purpose To assess the potential environmental impacts of a proposed project before it is undertaken Process Assess how proposed projects may impact the environment in a variety of categories as determined by the federal (NEPA) and state government (SEPA) Impacts If impacts are identified, the analysis evaluates the extent of those impacts, and if required, identifies ways to reduce or avoid them 10 Environmental Review Leads National Environmental Policy Act (NEPA) • Lead Agency: Federal Aviation Administration (FAA) • Sponsor: Port of Seattle/SEA • Document: Environmental Assessment (EA) State Environmental Policy Act (SEPA) • Lead Agency: Port of Seattle • Responsible Official: Port's Director of Aviation Environment & Sustainability • Document: Environmental Impact Statement (EIS) 11 Developing a Defined Purpose and Need for SAMP Projects Need (Problem) Purpose (Solution) Insufficient passenger processing facilities and gates to accommodate 56 million annual passengers (MAP) at an optimal level of service (LOS) Accommodate 56 MAP at an optimal LOS Insufficient facilities to accommodate projected cargo levels Accommodate projected cargo levels Portions of the airfield no longer meet current FAA airport design standards Provide airfield infrastructure that meets current FAA airport design standards Inefficient/inadequate taxiway layout Enhance the efficiency of the overall taxiway layout Lack of fuel storage to meet projected demand and the Port's Sustainable Aviation Fuel (SAF) initiative Meet projected fuel storage demand including SAF initiatives 12 Key to the Analysis is that Air Travel Demand Will Increase Regardless 13 The Environmental Review Evaluated 3 Alternatives No Action Hybrid Terminal Option Proposed Action • None of the proposed SAMP NTP projects would occur • New gates are connected to Concourse D and includes the second terminal. • Implements elements that best meets current and future needs while minimizing environmental impacts • 31 airside, cargo, landside, terminal, and airport/airline support projects • Would not implement actions to resolve current and future needs • Includes all other proposed SAMP NTP elements 14 First, FAA Released a Draft NEPA Environmental Assessment 15 Port Ensured Significant Comment Opportunity to the FAA's NEPA Draft • Duration (10/21 - 12/13/24): • Open houses (4): • Community presentations: 42 • Outreach: 53 days 230+ attendees Postcards Local Online Media Social Media Project Website Local Newspaper Videos Community Events Media Advisories Tours & Presentations 16 Extensive Outreach Helped Drive Comments to FAA 591 2,554 Comment Letters Unique Comments Themes: - Prepare an NEPA EIS - Comment Period - Alternatives - Air Quality/Climate - Cumulative Impact - Limit Growth - Environmental Justice - Study Area - Outreach - Purpose of NEPA - Mitigation - New Airport - Other Airports - Human Health - Noise - Trees - Connected Actions - Alternative Transportation - Children's Health and Safety Risks Analysis 17 In the FINAL EA, A Few Items Changed Greenhouse Gas Emissions 18 18 Conditions Were Noted in the FAA's FONSI ROD 18 conditions were identified that must be adhered to in the following resource categories: • Surface Transportation • Water Resources • Historical, Architectural, Archeological and Cultural Resources • Hazardous Materials, Pollution Prevention, and Solid Waste • Biological Resources 19 Surface Transportation Was Identified for ~$40 Million in Mitigation Mitigation identified for Category 1 and 2 intersections according to each jurisdiction's requirements by 2032 • 10 Category #1 Intersections - Physical improvements • 16 Category #2 Intersections - Physical improvements, payment (proportionate), or improvements planned *This requirement is triggered upon the construction of the first transportation-related NTP 20 Surface Transportations Intersections That Will Be Improved Intersections with Category 1 Impacts Jurisdiction/Agency Des Moines Memorial Dr. at S. 168th St. City of Burien Des Moines Memorial Dr. at S. 144th St. City of SeaTac 24th Ave. S at S 146th St. City of SeaTac 8th Ave. S at S. 156th St. City of SeaTac 16th Ave. S at S. 144th St. City of SeaTac S. 152nd St. at Des Moines Memorial Dr. S. City of SeaTac SR 518 Westbound Off-ramp at Des Moines Mem. Dr. WSDOT SR 518 Eastbound Off-ramp & 51st Avenue S. WSDOT Military Rd. S. at Southbound I-5 Ramps at S. 200th St. WSDOT Military Rd. S. at Northbound I-5 Ramps WSDOT 21 Now We Transition from NEPA to SEPA • The release of the FAA NEPA ROD starts a 60-day appeal period (as of 9/26/25). • In the meantime, the Port will begin work on the SEPA analysis. • That will include community outreach and a public comment period 22 SEPA Includes Additional Analyses • Earth • Air • Water • Plants and animals • Energy and natural resources • Environmental health • Land and shoreline use • Transportation • Public services and utilities • Climate* • Environmental Justice* • Cumulative Impacts* *Removed from NEPA Final EA 23 SEPA Will Include Enhanced Outreach and Engagement • Provide 30+ days notice before publishing Draft EIS • Materials and translation provided in seven languages • Outreach to airport-area stakeholders & public meetings in different locations to capture official comments as well as virtual meeting(s) • Targeted engagement with BIPOC and historically underrepresented communities with an emphasis in South King County • Outreach to public sector and regional leaders 24 FAA NEPA FEA & ROD Are One Step In A Continuing Process DRAFT SEPA EIS Published (Q1 2026) FINAL NEPA FEA & Decision (9/26/25) 2025 2026 FINAL NEPA FEA Appeal Period (60 days, 11/25/25) DRAFT SEPA EIS Agency & Public Review Complete (*30-60 days) FINAL SEPA EIS & SEPA Decision (Q4 2026) 2027 Commission Action Required NTP(s) approval FINAL SEPA EIS Appeal Period (60 days) WE ARE HERE 25 Questions? 26