TagSAMP(642)
Articles tagged with the Sustainable Airport Master Plan.
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2026-05-01Mitigation and Minimization Measures: Seattle-Tacoma International Airport SEPA EIS for the Sustainable Airport Master Plan Near-Term Projects
This appendix outlines the traffic mitigation measures required for the Seattle-Tacoma International Airport Sustainable Airport Master Plan Near-Term Projects, as mandated by the FAA's Record of Decision and the Port of Seattle's State Environmental Policy Act Environmental Impact Statement. It details specific intersection improvements across multiple jurisdictions—including the City of SeaTac, City of Burien, City of Des Moines, and WSDOT—such as new traffic signals, roundabouts, and turn lane additions, along with proportionate-share cost contributions where full mitigation is not required. The measures are designed to address projected traffic impacts through 2037 and maintain acceptable levels of service at affected intersections near the airport. -
2026-05-01Chapter 3: Affected Environment — Seattle-Tacoma International Airport SEPA Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects
This section of the Draft Environmental Impact Statement (EIS) for Seattle-Tacoma International Airport's Sustainable Airport Master Plan describes the existing environment surrounding the airport, which sits on approximately 2,800 acres in SeaTac, Washington, about 12 miles south of downtown Seattle. The study area covers roughly 3,692 acres bounded by nearby cities including Burien, Des Moines, and Tukwila, where surrounding land use is primarily residential, commercial, and parkland. Baseline environmental conditions are drawn from 2022 data to assess potential direct and indirect impacts of proposed near-term airport development alternatives. -
2026-05-01Appendix Q: List of Preparers — SEPA EIS and NEPA EA for the Sustainable Airport Master Plan Near-Term Projects
This appendix lists the individuals and organizations responsible for preparing the environmental review documents for Seattle-Tacoma International Airport's Sustainable Airport Master Plan Near-Term Projects. It includes two tables: one covering contributors to the State Environmental Policy Act (SEPA) Environmental Impact Statement, and one listing those who prepared the National Environmental Policy Act (NEPA) Environmental Assessment. Key contributors include staff from the Port of Seattle, consulting firms such as Parametrix, Landrum & Brown, CDM Smith, Concord Engineering, and RS&H, covering areas such as air quality, noise, climate change, safety, and biological resources. -
2026-05-01
Chapter 3: Affected Environment — Seattle-Tacoma International Airport SEPA Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects
Draft SEPA Environmental Impact Statement (EIS) Chapter 3, Affected Environment, for the Seattle-Tacoma International Airport (Sea-Tac Airport) Sustainable Airport Master Plan (SAMP) near-term projects, May 2026. Describes baseline conditions as of 2022 under WAC 197-11-444 within the General Study Area (GSA) encompassing 3,692 acres (5.8 square miles) in the City of SeaTac, King County, Washington. -
2026-05-01Appendix L: Surface Transportation (NEPA/SEPA)
This report analyzes existing traffic conditions around Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP) Near-Term Projects Environmental Review. It examines 108 intersections—including signalized, stop-controlled, and uncontrolled locations—along key travel routes connecting the airport to surrounding communities, focusing on weekday PM peak hour traffic volumes. The study also includes freeway analysis of SR 518 and I-5 ramps and segments at the request of WSDOT. -
2026-05-01
Appendix Q: List of Preparers — SEPA EIS and NEPA EA for the Sustainable Airport Master Plan Near-Term Projects
This appendix lists the individuals and organizations responsible for preparing the environmental review documents for Seattle-Tacoma International Airport's Sustainable Airport Master Plan Near-Term Projects. It includes two tables: one covering contributors to the State Environmental Policy Act (SEPA) Environmental Impact Statement, and one listing those who prepared the National Environmental Policy Act (NEPA) Environmental Assessment. Key contributors include staff from the Port of Seattle, consulting firms such as Parametrix, Landrum & Brown, CDM Smith, Concord Engineering, and RS&H, covering areas such as air quality, noise, climate change, safety, and biological resources. -
2026-05-01SAMP Near-Term Projects Draft EIS: Chapter 4 — Impacts and Mitigation Measures
This draft Environmental Impact Statement (EIS) evaluates the potential environmental effects of near-term construction and expansion projects at Seattle-Tacoma International Airport, comparing a No Action Alternative against two action alternatives through a projected analysis year of 2032, with an out-year assessment extending to 2037. The study examines impacts across multiple environmental categories—including air quality, noise, greenhouse gas emissions, and surface transportation—using forecasted aircraft operations and passenger levels for each alternative. Mitigation and minimization measures are identified to address any significant adverse impacts identified through the analysis. -
2026-05-01Draft Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects
The Port of Seattle has released a Draft Environmental Impact Statement (EIS) under Washington State's environmental review law for 31 near-term construction projects at Seattle-Tacoma International Airport (SEA). The projects, which include a new 19-gate terminal and an elevated busway system, are designed to handle up to 56 million passengers by 2032. While a prior federal review found no significant environmental impacts requiring mitigation except for surface transportation, this state-level review evaluates two action alternatives alongside a no-action scenario. -
2026-05-01
SAMP Near-Term Projects Draft EIS: Chapter 4 — Impacts and Mitigation Measures
Chapter 4 of the Seattle-Tacoma International Airport (Sea-Tac Airport) Sustainable Airport Master Plan (SAMP) Near-Term Projects Draft SEPA Environmental Impact Statement (EIS), dated May 2026. Covers potential adverse environmental impacts and mitigation measures for Alternative 1 (No Action), Alternative 2 (Proposed Action), and Alternative 3 (Hybrid Terminal Option) under WAC 197-11-444. Analysis years are 2032 -
2026-05-01
Draft Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects
Port of Seattle Draft Environmental Impact Statement (EIS) under Washington State Environmental Policy Act (SEPA), Chapter 43.21C RCW, for Seattle-Tacoma International Airport (SEA) Sustainable Airport Master Plan (SAMP) Near-Term Projects (NTPs). Covers 31 Near-Term Projects including a new terminal with 19 gates and an elevated busway with three stations connecting rental car facility, new terminal,