Appendix E: Coastal Resources — FAA CZMP Negative Determination and Washington State Department of Ecology Response for Sea-Tac Airport Near-Term Projects

The FAA issued a Negative Determination in July 2024, concluding that planned Near-Term Projects at Seattle-Tacoma International Airport (SEA) are not likely to cause coastal effects under the Coastal Zone Management Act. The projects include taxiway extensions, blast pad expansions, and relocation of navigational equipment across four airfield areas, with construction set to begin in 2026 over a six-year period. Because all FAA actions are confined to upland areas within the airport property, no significant impacts to Washington State's coastal zone resources were identified.

Notes

FAA Northwest Mountain Region Denver Airports District Office letter dated July 2, 2024, to Washington Department of Ecology Federal Consistency Coordinator Loreé Randall, documenting a Negative Determination under 15 CFR Part 930.35 (Coastal Zone Management Act) for the Seattle-Tacoma International Airport Sustainable Airport Master Plan (SAMP) Near-Term Projects (NTPs). FAA determined that 31 NTPs are not reasonably likely to result in coastal effects. Four airfield projects involve FAA actions: A01 Taxiway A/B Extension (relocate Runway 34R glideslope antenna, adjust PAPI), A02 Runway 16R/34L Blast Pads (relocate navigational aids 200 feet north), A04 Taxiway B 500-foot Separation (relocate navigational aids), and A06 Runway 34L High Speed Exit (relocate multilateration remote unit). All FAA actions occur in upland areas; construction starts 2026 over six years. Port of Seattle responsible for Consistency Certification under Clean Water Act. Washington State coastal zone, CZMA, 15 CFR Part 930 Subpart C and D referenced. Appendix E of 2024 Draft Environmental Assessment.

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