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  • 2024-10-17

    2025 StART State Leg Priorities 10.17.24

    A policy document from the SEA Stakeholder Advisory Round Table outlining five shared priorities for the 2025 Washington State Legislative Session, including noise insulation repair, regional airport capacity, air quality, Sustainable Aviation Fuel (SAF) production, and decarbonizing ground transportation at Seattle-Tacoma International Airport. The document is issued jointly by the Port of Seattle and near-airport communities.
  • 2024-10-06

    StART 2025 State Legislative Agenda

    The SEA Stakeholder Advisory Round Table outlines five shared policy priorities for Washington State's 2025 legislative session, aimed at balancing Seattle-Tacoma International Airport's economic growth with the needs of surrounding communities. Key proposals include repairing noise insulation in nearby homes, improving regional air quality, expanding sustainable aviation fuel production, and reducing transportation emissions through electrification and transit investments. The document also calls for stronger state leadership and funding to plan for additional regional airport capacity.
  • 2024-10-01

    Sustainable Airport Master Plan near-term projects environmental review

    The Port of Seattle is conducting an environmental review of near-term construction projects at Seattle-Tacoma International Airport (SEA) under the FAA's National Environmental Policy Act (NEPA) process, with a public comment period running October–November 2024. Originally built in 1949 to serve half a million passengers per year, SEA now handles over 50 million annually and is projected to reach 67.2 million passengers by 2035 as the Central Puget Sound region's population grows. The Sustainable Airport Master Plan outlines infrastructure improvements needed to accommodate this long-term growth.
  • 2024-08-28

    StART agenda: August 28, 2024

    The StART (SEA Stakeholder Advisory Round Table) meeting held on August 28, 2024, focused on updates to the FAA's Noise Policy Review and the latest activities from StART's Policy Working Group and Aviation Noise Working Group. Key presentations were led by an FAA Environmental Protection Specialist and Port of Seattle staff, with time allotted for public comment. The meeting was conducted via Zoom, with the next session tentatively scheduled for October 23, 2024.

  • Pages from June 10, 2024 Aviation Noise Working Group Part 150 Study Technical Review Committee Meeting #1_0001

    Slide 23 from a Port of Seattle presentation on aircraft noise at Seattle-Tacoma International Airport, explaining key noise metrics including Single Event Sound Level (SEL), Hourly LEQ, and Day-Night Level (DNL). The right panel illustrates that identical DNL 65 levels can result from 1 event/day at SEL 114.4 dBA, 10 events/day at SEL 104.4 dBA, or 100 events/day at SEL 94.4 dBA.

  • DNL65 Airplane Modeling Graphic Pages from June 10, 2024 Aviation Noise Working Group Part 150 Study Technical Review Committee Meeting #1_0001

    This aviation noise education graphic illustrates that Day-Night Average Sound Level (DNL) 65 dBA can result from 1 event/day at SEL 114.4 dBA, 10 events/day at SEL 104.4 dBA, or 100 events/day at SEL 94.4 dBA. The diagram uses aircraft icons to visually demonstrate how DNL integrates both frequency and intensity of noise events into a single equivalent metric.

  • SEL and DNL 65 Noise Metrics Educational Slide — Port Of Seattle Part 150 Study

    An educational slide produced by the Port of Seattle for Seattle-Tacoma International Airport explaining aircraft noise metrics, including Single Event Sound Level (SEL), Hourly LEQ, and Day-Night Level (DNL). The slide illustrates how varying numbers of daily flight events (1, 10, or 100) can produce identical DNL 65 noise levels, and includes charts showing sound levels over time periods ranging from seconds to 24 hours.
  • 2024-06-10

    Part 150 Study Technical Review Committee Meeting #1

    The Port of Seattle held the first Technical Review Committee (TRC) meeting on June 10, 2024, to kick off a Part 150 noise study for Seattle-Tacoma International Airport. The meeting covered the committee's purpose and role, an airport overview, an introduction to aircraft noise modeling, land use compatibility, and the project schedule. Environmental consulting firm ESA, with experience at more than 230 airports nationwide, is leading the study.
  • 2024-06-10

    SEL, Hourly LEQ, and DNL Aircraft Noise Measurement Diagram — Part 150 Study Technical Review Committee Meeting #1

    Three-panel educational diagram illustrating how aircraft noise is measured and averaged across different time scales: Single Event Sound Level (SEL) showing two aircraft flyovers with Lmax and duration annotations, Hourly LEQ showing cumulative noise over one hour, and Day-Night Level (DNL) showing 24-hour noise distribution with a 10-dB nighttime penalty applied during nighttime hours. No source organization or document identifier is visible.
  • 2024-05-22

    SEA Stakeholder Advisory Round Table 2023 Annual Report

    The SEA Stakeholder Advisory Round Table (StART) 2023 Annual Report, presented by Port of Seattle staff Marco Milanese and Nate Caminos, summarizes the group's work addressing aviation noise and federal policy issues around Seattle-Tacoma International Airport. The report highlights efforts from two key working groups: the Aviation Noise Working Group and the Federal Policy Working Group, which engage community stakeholders in shaping airport noise mitigation strategies. The presentation also includes a Q&A section to allow stakeholder input and discussion.