FAA CZMP Negative Determination Letter: Seattle-Tacoma International Airport Near-Term Projects

The FAA issued a Negative Determination in July 2024, concluding that planned near-term construction and equipment-relocation projects at Seattle-Tacoma International Airport are not likely to cause effects on Washington State's coastal zone. The 31 Near-Term Projects—drawn from the airport's Sustainable Airport Master Plan—include taxiway extensions, blast pad expansions, and high-speed runway exits, with FAA involvement limited to relocating navigational aids and adjusting flight procedures on airport property. The Washington State Department of Ecology was asked to concur with this finding under the Coastal Zone Management Act.

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FAA Northwest Mountain Region Denver Airports District Office letter dated July 2, 2024, to Loreé Randall, Federal Consistency Coordinator, Washington Department of Ecology, documenting a Negative Determination under 15 CFR Part 930.35 (Coastal Zone Management Act) for the Sustainable Airport Master Plan (SAMP) Near-Term Projects (NTPs) at Seattle-Tacoma International Airport (Sea-Tac Airport). FAA determined the 31 NTPs are not reasonably likely to result in coastal effects. Four airfield projects involve FAA actions: A01 Taxiway A/B Extension (relocation of Runway 34R glideslope antenna), A02 Runway 16R/34L Blast Pads (navigational aids relocation), A04 Taxiway B 500-foot Separation (navigational aids relocation), and A06 Runway 34L High Speed Exit (multilateration remote unit relocation). All FAA actions occur in upland areas within the General Study Area. Port of Seattle is responsible for Consistency Certification for NTPs requiring Clean Water Act permits. Construction begins 2026 over six years.

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