Notes
Chapter 2 of the Final Environmental Assessment (EA) for the Sea-Tac Airport (KSEA) Sustainable Airport Master Plan (SAMP) Near-Term Projects, dated September 2025. Covers the NEPA-required alternatives evaluation process including two-step screening (Level 1: Purpose and Need; Level 2: operational impacts and cost), the No Action Alternative, and Table 2-1 evaluating scoping-suggested alternatives such as phased construction of passenger gates (56 MAP, 110 operations per hour), terminal processing facility expansion, roadway/curbside changes, full taxiway separation (500-foot Runway 16L/34R and Taxiway B), limited/reduced growth, use of other existing airports, building a new regional airport, alternative transportation modes (high-speed rail, hyperloop), elimination of North Employee Surface Parking Lot L06 (replaced by employee parking garage L07), public/private transit incentives, and secure-side terminal connection to Concourse D. Conducted under FAA Order 1050.1F and FAA Order 5050.4B. Analysis completed by Landrum & Brown, 2020.