Tagenvironmental assessment(30)

This October 2024 Draft Environmental Assessment, prepared by Landrum & Brown for the Port of Seattle and the FAA, evaluates the environmental impacts of near-term construction projects at Seattle-Tacoma International Airport as part of its Sustainable Airport Master Plan. The assessment covers a wide range of environmental topics—including noise and noise-compatible land use, air quality, water resources, and environmental justice—for proposed improvements to passenger terminals, cargo facilities, airfield design, taxiways, and fuel storage. It is intended to support FAA decision-making under the National Environmental Policy Act (NEPA) and addresses the airport's ability to accommodate a projected 56 million annual passengers.

This appendix summarizes the public and agency engagement activities conducted as part of the Environmental Assessment (EA) for Seattle-Tacoma International Airport's Sustainable Airport Master Plan Near-Term Projects. Outreach included scoping meetings held in 2018 with seven agencies and four public sessions in surrounding cities, as well as advertisement in multiple languages across newspapers, email, and social media. Public meetings were scheduled in November 2024 at locations in Federal Way, Des Moines, Burien, and SeaTac, with a comment deadline of December 5, 2024.

The Port of Seattle announced the release of a draft Environmental Assessment (EA) for Seattle-Tacoma International Airport's Sustainable Airport Master Plan (SAMP) on October 21, 2024, covering 31 near-term development projects including a second terminal, elevated busway, and new cargo facilities. The plan addresses projected regional population growth of one million people by 2035. Members of the public were invited to submit comments on potential environmental impacts during an open comment period running from October 21 to December 5, 2024.

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.

This document contains a January 2019 invoice from the law firm Lockridge Grindal Nauen P.L.L.P. to the City of Burien for $1,275 in legal services related to Preliminary Environmental Assessment Modeling, covering 5 hours of work by five attorneys. The invoice was revised in April 2019 to correct hourly rates in line with a contract amendment, and payment was approved by the City of SeaTac's Community & Economic Development Director after confirmation that the contract had been corrected.

This document explains the noise metrics used to evaluate aircraft noise around Seattle-Tacoma International Airport, including decibels (dB), A-weighted decibels (dBA), and the Day-Night Average Sound Level (DNL). It describes how sound is measured on a logarithmic scale, meaning noise levels don't add up the way ordinary numbers do, and explains why A-weighted measurements are the standard used by the FAA and EPA because they best match how human ears perceive sound. These concepts form the technical foundation for assessing the environmental impact of proposed flight arrival procedures at Sea-Tac.

This document is Appendix D of the Final Environmental Assessment for proposed new arrival flight procedures at Seattle-Tacoma International Airport, dated November 1, 2012. It contains TARGETS files—technical routing data packages used to define new RNAV (area navigation) flight paths, such as the HAWKZ RNAV Version 4.2 procedure, which charts a series of waypoints guiding arriving aircraft toward Sea-Tac from the south. The files were prepared in coordination with Seattle ARTCC and are intended to support evaluation of how the new routes may affect noise levels in surrounding communities.

This appendix from a 2012 Environmental Assessment documents the published arrival flight procedures at Seattle-Tacoma International Airport that would be affected by proposed changes to how aircraft approach the airport. It includes detailed charts for routes such as the JAWBN Three Arrival and Olympia Seven Arrival, showing waypoints, altitudes, and speed restrictions for aircraft arriving from various directions including Canada and southern Washington. These procedures define the flight paths aircraft must follow when descending into Sea-Tac, directly influencing the noise experienced by communities surrounding the airport.