Item No: 11b supp Meeting Date: May 26, 2026 Sustainable Airport Master Plan Near-Term Projects State Environmental Policy Act Draft Environmental Impact Statement and Next Steps AGENDA • Near-Term Projects (NTP) • National Environmental Policy Act (NEPA) - Final Environmental Assessment - FAA Finding of No Significant Impact and Record of Decision • State Environmental Policy Act (SEPA) - What is required - Draft SEPA Environmental Impact Statement (EIS) • Next Steps • Outreach and Engagement 2 SAMP Near-Term Projects 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 Busway and Stations Roadway Improvements Second Terminal Airline Support 3 Purpose of Environmental Reviews Purpose. To assess the potential environmental impacts of a proposed project (e.g., SAMP NTPs) before it is undertaken and inform decision makers. Process. Assess how proposed projects may impact the environment in a variety of categories as determined by the federal government (NEPA) and the 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. 4 How Environmental Review Impacts are Analyzed 600,000 Proposed Action Constrained Scenario 550,000 Potential Impact(s) of SAMP NTPs No Action Constrained Scenario 450,000 EXISTING OPERATIONS 400,000 350,000 300,000 2037 2036 2035 2034 2033 2032 2031 2030 2029 2028 2027 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 250,000 2016 Aircraft Operations 500,000 5 Port Policies & Programs Minimize Impacts SAMP Near-Term Projects The NTPs are being analyzed under regulatory frameworks to identify potential environmental impacts and mitigate for any significant impact. Port Policies and Programs SEA has many voluntary programs in place to reduce its overall impacts on the community that do not require an environmental evaluation to enact. These include: • Emissions reductions • Noise management and sound insulation • Community capacity building and South King and Port Community Fund grants • Workforce development • Sustainability features 6 Environmental Review Leads National Environmental Policy Act (NEPA) • Lead Agency: • Sponsor: • Document: Federal Aviation Administration (FAA) Port of Seattle/SEA Environmental Assessment (EA) State Environmental Policy Act (SEPA) • Lead Agency: • Responsible Official: • Document: Port of Seattle Port's Director of Aviation Environment & Sustainability Environmental Impact Statement (EIS) 7 FINAL NEPA Environmental Assessment Farmlands Not present No impacts Less than significant impacts Less than significant impacts with mitigation measures Wild and Scenic Rivers Historical, Architectural, Archaeological, and Cultural Resources Land Use Department of Transportation Act Section 4(f) Visual Effects Coastal Resources Air Quality Noise and NoiseCompatible Use Socioeconomic, Children's Environmental Health, and Safety Risks Greenhouse Gas Emissions Energy and Natural Resources Water Resources Hazardous Materials, Solid Waste, and Pollution Prevention Biological Resources Significant impacts Requiring mitigation *Mitigation identified in the NEPA EA was carried forward into the DRAFT SEPA EIS Surface Transportation 8 Conditions in the FAA Record of Decision 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 *Mitigation identified in the NEPA EA was carried forward into the DRAFT SEPA EIS 9 Surface Transportation 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 Cost: ~$40M in transportation improvements 10 Additional Analyses and Requirements in SEPA SEPA technical analyses was conducted to complement the rigor of the NEPA EA Additional required analyses: - GHGs and Climate, Earth, Transportation, Housing, Plants, Animals, and Cumulative Impacts Additional voluntary analyses: - Air Quality, Noise, Human Health, and Environmental Justice 11 Addressing Impacts Mitigation. Triggered when impacts exceed significance thresholds • Example: Surface Transportation and level of service improvements Minimization Measures. Existing SEA programs (regulatory and voluntary) intended to reduce impacts now and in the future. • Examples: Air quality and emission reduction programs, stormwater Best Management Practices (BMPs), Sustainable Evaluation Framework, and the Land Stewardship Plan. 12 Draft SEPA Environmental Impact Statement Aesthetics, Light and Glare No impacts Limited impacts that are not significant Limited impacts that are not significant because of regulatory requirements* Public Services and Utilities Historical, Architectural, Archaeological, and Cultural Resources Land and Shoreline Use Earth Housing Recreation Air Quality Noise Socioeconomic and Environmental Justice Climate Energy and Natural Resources Water Resources Hazardous Materials, Solid Waste, and Spill Prevention Plants and Animals Significant impacts triggering mitigation* *Mitigation identified in the NEPA EA was carried forward into the DRAFT SEPA EIS Surface Transportation 13 Air Quality Updates Methodology. Updated NEPA emissions inventories. Conducted additional analysis in SEPA. Both include construction and operations. Findings. Temporary constructionrelated emissions during the buildout period and small, long-term increases in operational emissions. Consistent with magnitude of change in NEPA EA. Limited impacts. 14 Air Quality and Human Health Updates Methodology. Conducted a Human Health Risk Assessment focused on toxic air pollutant exposure and cancer risks Findings. Emissions would not exceed health-based air quality standards 15 Air Quality Impact Reductions Construction • Implement Best Management Practices (BMPs) that include required maintenance and repair of equipment, minimizing idling, and equipment specifications Operations • Pre-conditioned air (PC Air), ground power, electric ground support equipment (eGSE), renewable natural gas, alternative fuel fleet/airside vehicles, and public alternative transportation strategies 16 Particulate Matter and Human Health Updates What Was Done • Literature review on recent research and gaps in potential health effects from exposure to ultrafine and ultra-ultrafine particulate matter Findings • The current state of the science does not support independent causal ultrafine particulate effects to human health • Lack of broad-scale, multi-year epidemiological studies on aviation emissions 17 Climate Updates Methodology: Adhere to Commission Resolution No. 3650. Conducted a new and enhance analysis in SEPA to calculate GHG emissions and assess risk to facilities Findings: Modest increase in emissions (2032: 2.1% and 2037: 7.7%). No large-scale risks to Port facilities identified. 18 Climate Impact Reductions Construction • Implement Best Management Practices (BMPs) that include required maintenance and repair of equipment, minimizing idling, and equipment specifications Operations • Pre-conditioned air (PC Air), ground power, electric ground support equipment (eGSE), renewable natural gas, alternative fuel fleet/airside vehicles, and public alternative transportation strategies 19 Noise and Human Health Updates What Was Done • Literature review on recent research on potential health effects from exposure to aviation noise Findings • Aircraft noise exposure can have effects on levels of annoyance and sleep disturbance (no regulatory standard) • Lack of broad-scale aviation-focused studies to understand health effects of aviation noise 20 Noise Impact Reductions Construction • Adherence to Port's Construction General Requirements, State of Washington, and City of SeaTac BMP requirements Operations • Fly Quiet Incentive Program, Late Night Noise Limitation Program, restrictive Aircraft Engine Runups, and Part 150 programs (past and present) 21 Environmental Justice Updates Methodology. WADOH's Environmental Health Disparities Map and Port's Equity Index Findings. The SAMP NTPs would not substantially contribute to any of the factors or indicators analyzed. No significant adverse impacts to environmental justice communities. 22 Environmental Justice Impact Reductions Mitigation and other impact reduction measures identified in all SEPA Elements of the Environment, including air quality, plants and animals, surface transportation, socioeconomics, noise, hazardous materials, and water resources would minimize impacts to environmental justice communities 23 Cumulative Impacts Methodology: Consider direct and indirect impacts of past, present, and reasonably foreseeable future projects in conjunction with the SAMP NTPs. Findings: The SAMP NTPs, when combined with past, present, and reasonably foreseeable future projects, would not result in significant cumulative environmental impacts. 24 Next Steps WE ARE HERE 2025 FINAL NEPA FEA & Decision (9/26/25) 2026 FINAL NEPA FEA Appeal Period (60 days, 11/26/25) DRAFT SEPA EIS Publication (5/22/26) FINAL SEPA EIS & SEPA Decision (Q4 2026) 2027 Commission Action Required NTP(s) approval DRAFT SEPA EIS Agency & FINAL SEPA EIS Appeal Period Public Review (21 days) (60 days) 25 Agency and Public Comment Period 30-day Public Notice • April 22 Public comment period • May 22 - July 21 (60 days) Public Meetings • June 22; 6:00PM - 8:00PM (SeaTac) • June 23; 6:00PM - 8:00PM (Des Moines) • June 25; 6:00PM - 8:00PM (Federal Way) • June 27; 10:00AM - Noon (Burien) 26 Outreach and Engagement • Use plain, accessible language when communicating • Communicate via multiple tools to reach various audiences - Website, email updates, presenting at community meetings, and inperson and virtual meetings • Remove barriers to participation - Translation tools online and printed materials in ten languages • Partner with community leaders - Briefings at community meetings, present to area cities, and partner with community-based organizations 27 Outreach and Engagement Public Meetings: Four in-person public meetings Virtual Meetings: Virtual meetings with translation capabilities Media: Social media, press releases, and existing Port email newsletters about the 30-Day Notice, Publication, and the official comment process Online Resources: SAMP- and SEPA-specific website 28 Take Aways • Substantial new technical analyses for air quality, noise, human health, and environmental justice • No new significant impacts identified in the DRAFT SEPA EIS • DRAFT SEPA EIS will be published May 22 - Public comment period May 22 to July 21 (60 days) 29 Questions? 30