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STNI

STNISea-Tac Noise.Info

  • Solve for Sea-Tac. Solve for every airport.
  • Since 2016, working to obtain justice for everyone living under the flight path.
  • Less Noise. Cleaner Air. Better Public Health. Compensation.
  • Everything you think you know about the airport is wrong.

TagSEPA(233)

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  • 2000-01-24

    EXH AR44097: Port Of Seattle SEPA Addendum — Third Parallel Runway Wetland Fill and Temporary Construction-Only Interchange at SR 509/South 176th Street

    SEPA Addendum dated January 24, 2000, Port Of Seattle, POS SEPA No. 00-02, addressing modifications to the Master Plan Update Development Actions for the Third Parallel Runway at Seattle-Tacoma International Airport. Addendum covers: (1) increased wetland acreage affected by the project, revised from 12.23 acres to 18.33 acres, with 15.41 acres affected by the runway
    TagsACC, Environmental Impact Statement, Pollution Control Hearings Board, Port Of Seattle, SEPA, SR509, Third RunwayFolderBox 18
  • 1999-11-15

    EXH AR043099: Court of Appeals Decision — ACC et al. v. Puget Sound Regional Council, Port Of Seattle et al. (No. 43100-5-I)

    Published opinion filed November 15, 1999, Washington Court of Appeals Division One, No. 43100-5-I. Cities of Des Moines, Burien, Federal Way, Normandy Park, Tukwila, Highline School District No. 401, and Airport Communities Coalition (appellants) v. Puget Sound Regional Council, Port Of Seattle, and Commissioners of the Port Of Seattle (respondents). Consolidated with related cases including
    TagsACC, CASE, Pollution Control Hearings Board, Port Of Seattle, Puget Sound Regional Council, SEPAFolderBox 18
  • 1999-08-01

    EXH AR042630: Draft Wetlands Re-Evaluation Document — STIA Master Plan Update Improvements

    Draft Wetlands Re-Evaluation Document prepared by Port Of Seattle in August 1999 for Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements. Addresses new information on wetlands and aquatic resources affected by the planned new third runway and related improvements, not available during preparation of the 1996 Final Environmental Impact Statement (FEIS) or 1997 Final Supplemental
    TagsACC, Environmental Impact Statement, NEPA, Pollution Control Hearings Board, Port Of Seattle, SEPA, Third RunwayFolderBox 18
  • 1998-12-10

    Supplemental Declaration of Lawrence Corvari Supporting CASE’s Consolidated Opposition Brief

    In this 1998 court declaration, Lawrence Corvari, Co-President of Citizens Against SeaTac Expansion (CASE), challenges the Port of Seattle's Auburn Mitigation Plan and its environmental review determination. Corvari argues that building replacement wetlands in Auburn rather than near the affected Miller Creek or Des Moines Creek watersheds leaves adverse environmental impacts unmitigated, harming CASE members' ability to enjoy local wildlife and a healthy environment. The declaration also corrects what Corvari describes as misrepresentations of his deposition testimony by the Port's attorneys in their Motion to Dismiss for Lack of Standing.
    TagsAuburn Wetland, CASE, Citizens Against Sea-Tac Expansion, Port Of Seattle, SEPAFolderCASE #98-2-23944-1 SEA
  • 1998-10-31

    Declaration of Helen Kludt Supporting Plaintiff’s Petition for a Writ of Review

    Helen Kludt, a Normandy Park resident who has lived near Miller Creek since 1956, submitted this 1998 court declaration supporting a legal challenge against the Port of Seattle's plans to expand Sea-Tac Airport with a third runway. She argues that the Port's proposal to destroy wetlands in the Miller Creek Basin and offset environmental impacts through out-of-basin mitigation in Auburn is inadequate and violates the State Environmental Policy Act (SEPA). Kludt contends the expansion will harm her property value, degrade local wildlife habitat, and worsen flooding along Miller Creek.
    TagsAuburn Wetland, CASE, Citizens Against Sea-Tac Expansion, Miller Creek, SEPAFolderCASE #98-2-23944-1 SEA
  • 1998-10-02

    Declaration of Lawrence Corvari Supporting Plaintiff’s Petition for a Writ of Review

    In October 1998, Lawrence Corvari, Co-President of Citizens Against Seatac Expansion (CASE), filed a declaration in King County Superior Court supporting a petition for a writ of review against the Port of Seattle. The declaration states that CASE directed its attorneys to appeal the Port's SEPA Determination of Non-Significance (DNS) related to the Auburn Mitigation Project, arguing that the Port's failure to comply with environmental review requirements harmed both the organization's members and the Miller Creek Basin environment.
    TagsAuburn Wetland, CASE, Citizens Against Sea-Tac Expansion, Port Of Seattle, SEPAFolderCASE #98-2-23944-1 SEA
  • 1997-12-05

    EXH AR041439: Findings, Conclusions, and Decision — City of Des Moines et al. v. Port Of Seattle (HE 96-04)

    Hearing Examiner Findings, Conclusions, and Decision in case No. HE 96-04, Airport Communities Coalition (ACC) — comprising City of Des Moines, City of Burien, City of Federal Way, City of Normandy Park, City of Tukwila, and Highline School District #401 — versus Port Of Seattle regarding adequacy of the SEPA Environmental Impact Statement (EIS) and
    TagsACC, Environmental Impact Statement, Pollution Control Hearings Board, Port Of Seattle, Sea-Tac Airport Master Plan, SEPAFolderBox 17
  • 1997-05-01

    Final Supplemental Environmental Impact Statement for the Proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport, Volume 2: Appendices C-2 Through F

    This 1997 Final Supplemental Environmental Impact Statement evaluates the environmental effects of proposed expansion projects at Seattle-Tacoma International Airport, including construction of a new 8,500-foot third parallel runway, terminal improvements, and expanded parking and cargo facilities. The document examines potential impacts such as wetland disturbance, floodplain encroachment, stream relocation, and air, water, and noise quality effects on surrounding communities. It was prepared jointly under the National Environmental Policy Act and Washington State Environmental Policy Act to address concerns arising from continued growth in aviation activity levels.
    TagsEIS, Environmental Impact Statement, NEPA, SEPA, Third RunwayFolderSTIAMPU-EIS
  • 1997-05-01

    Final Supplemental Environmental Impact Statement for the Proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport — Volume 3, Appendix G: Public and Agency Comments on the February 1997 Draft Supplemental EIS

    This 1997 Final Supplemental Environmental Impact Statement (SEIS) evaluates the environmental effects of proposed expansion projects at Seattle-Tacoma International Airport, including the construction of a new 8,500-foot third parallel runway, terminal improvements, parking expansions, and cargo facilities. The document addresses a range of potential impacts such as noise, air and water quality, wetlands, and floodplains resulting from increased aviation activity. It was prepared jointly under federal (NEPA) and Washington State (SEPA) environmental review requirements by the Port of Seattle and the Federal Aviation Administration.
    TagsEIS, Environmental Impact Statement, NEPA, Port Of Seattle, SEPA, Third RunwayFolderSTIAMPU-EIS
  • 1996-05-28

    Environmental Impact Statement Addendum To: The Flight Plan Project Final EIS (1992) and the Proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport Final EIS (1996)

    In May 1996, the Puget Sound Regional Council issued this Environmental Impact Statement Addendum to evaluate a proposal to add a third runway at Seattle-Tacoma International Airport (Sea-Tac) with specific noise reduction measures. The addendum was needed because a prior 1993 resolution authorizing the third runway had lapsed after the Port of Seattle failed to meet an independent noise-reduction review deadline by April 1, 1996. The Council considered new conditions and expert panel recommendations to reintroduce the third runway into the region's Metropolitan Transportation Plan while addressing community noise concerns.
    TagsEnvironmental Impact Statement, Puget Sound Regional Council, Sea-Tac Airport, SEPA, Third RunwayFolderPRR-2026-07-30

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Upcoming Events

  • Stay Grounded Event: Night trains, not night planes!
    Add to CalendarMSunday Sep 13: 12:00am
    Ntnnp social media3

    For the past two years, more than 220 initiatives from 15 countries have declared September 13th as the International day for the ban of night flights at airports. In parallel, activists across Europe have been gathering for pyjama parties for night trains – coordinated in 2024 and 2025 by Back on Track and Stay Grounded.

    [...]
  • Burien Airport Committee Meeting September 15, 2026
    Add to CalendarMTuesday Sep 15: 6:00pm
    400 SW 152nd St, Burien, WA 98166
    Burien airport committee 15 sep 2026 agenda pdf pdf

    a) Part 150 Noise Study (Emily Inlow-Hood) — 15 minutes
    b) SAMP Update and Next Steps (Brian Davis and Sarah Moore) — 15 minutes
    c) Legislative Updates — 10 minutes
       • SCA (Sarah Moore)
       • Work with Sen. Orwall (Brian Davis)
    d) StART Reorganization (Jeff Harbaugh and Karen Veloria) — 10 minutes

    [...]

[See all...]


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Issues

Sea-Tac Airport is currently undergoing the largest and longest expansion in its history, collectively known as the Sustainable Airport Master Plan (SAMP). Some of it you can already hear, but you’re probably not aware of what it all means. Here’s what you need to know.
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Read This!

As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.
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