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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.

TagStormwater(373)

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  • Stcp chapter 633 pg unknown sources of water quantity problems miller creek basin

    Miller Creek Basin Drainage Sub-Areas Map — Sea-Tac Communities Plan (STCP Section 6.3.3)

    A drainage map from the Sea-Tac Communities Plan, sponsored by the Port of Seattle and King County (document reference 6.3.3, POS 21001), showing the Miller Creek Basin divided into numbered drainage sub-areas with general impervious surface factors (under 20% to 50% or greater) and percentage of total runoff contributions (40%, 28%, 18%, and 14%) for each major zone.
    TagsMap, Miller Creek, Sea-Tac Communities Plan, STCP, StormwaterFoldermaps
  • Stcp chapter 6 pg 6 sources of water quantity problems des moines creek

    Sea-Tac Communities Plan: Des Moines Creek Drainage Sub-Areas and Runoff Sources

    A planning map from the Sea-Tac Communities Plan (document POS 21002, section 6.3.3) showing drainage sub-areas for Des Moines Creek, with impervious surface factors ranging from under 20% to 50% or greater, and annotating that 80% of total runoff originates from the northern sub-areas and 20% from the southern sub-areas. Sponsored by the Port of Seattle and King County.
    TagsDes Moines Creek, King County, Map, Sea-Tac Communities Plan, StormwaterFoldermaps
  • 2025-08-12

    City of Normandy Park City Council Regular Meeting Agenda — August 12, 2025

    The Normandy Park City Council held a regular meeting on August 12, 2025, covering routine consent items such as an interlocal jail services agreement and past meeting minutes, as well as new business including stormwater planning, property demolition, transportation grant applications, and ordinance updates on business licenses, utility regulations, and motorized scooters. The council also considered a proclamation on homelessness policy and accepted a City Hall building evaluation report. The meeting concluded with an executive session to discuss legal risks with counsel.
    Tagscity council, City of Normandy Park, Interlocal Agreement, Normandy Park, StormwaterFolderNormandy Park
  • Tribes call for national ban on salmon-killing chemical in car tires

    by John Ryan Three Northwest tribes have petitioned the federal government to ban a salmon-killing chemical found in tires and urban streams worldwide. As car and truck tires wear and leave behind skid marks and tire dust, the rubber stabilizer known as 6PPD turns into 6PPD-quinone (also called 6PPD-q), one of the most toxic substances
    CategoriesFrom The Web TagsKUOW, SR509, Stormwater, Water Quality
  • 2023-06-07

    Infrastructure improvements 2017-18

    The City of Normandy Park, Washington completed several infrastructure improvement projects in 2017-18, including a $330,000 sidewalk project on 1st Avenue, a $2.2 million stormwater and paving project serving 250 homes in the Manhattan View area, and a $1.6 million Normandy Road Project. Additional work included a $375,000 road overlay on Marine View Drive and $25,000 in Recreation Center sidewalk and access improvements. This document provides a photographic overview of completed municipal construction projects in Normandy Park.
    TagsCity of Normandy Park, Highline Forum, local government, Normandy Park, Parks, StormwaterFolderHighline Forum 2017
  • 2022-12-01

    Seattle-Tacoma International Airport Stormwater Pollution Prevention Plan (SWPPP) December, 2022

    Stormwater Pollution Prevention Plan (SWPPP) for Seattle-Tacoma International Airport (Sea-Tac Airport), published by Port Of Seattle in December 2022, in accordance with NPDES Permit No. WA-0024651. Covers facility assessment, IWS and SDS drainage areas, receiving waters, industrial activities, materials inventory, spills and leaks, monitoring plan, illicit non-stormwater discharges, best management practices (BMPs) including operational source
    TagsNPDES, Port Of Seattle, Sea-Tac Airport, Stormwater, Water QualityFolderSea-Tac Airport
  • 2022-09-12

    Discharge Monitoring Reports (DMR’s) and water pollution historical documents

    This archive documents a long history of water pollution discharged from Seattle-Tacoma (Sea-Tac) Airport into nearby waterways, dating back to 1948. It includes Discharge Monitoring Reports filed by the Port of Seattle showing high concentrations of glycol and other chemicals flowing into local stormwater systems and ultimately Puget Sound, as well as historical letters from the 1950s describing fish kills in Miller Creek and Des Moines Creek caused by airport runoff. The records reveal decades of regulatory correspondence between the Port of Seattle and Washington State pollution authorities over inadequate waste disposal practices.
    TagsMiller Creek, NPDES, pollution, Port Of Seattle, RCAA, StormwaterFolderRCAA
  • 2022-09-12

    Fact sheet for NPDES permit WA-002465-1, Sea-Tac International Airport

    This document is an NPDES (National Pollutant Discharge Elimination System) permit fact sheet for Sea-Tac International Airport, issued by the Washington State Department of Ecology. It details the locations of numerous water discharge outfalls across the airport property, covering industrial wastewater, stormwater from industrial activities, and stormwater from construction activities. The discharges flow into several local waterways including Des Moines Creek, Miller Creek, Walker Creek, Gilliam Creek, and Puget Sound.
    TagsEcology, NPDES, RCAA, Sea-Tac Airport, Stormwater, Water QualityFolderRCAA
  • 2022-09-12

    Opening brief of petitioner Citizens Against Sea-Tac Expansion

    This legal brief was filed by Citizens Against Sea-Tac Expansion before the Washington Supreme Court, challenging a decision by the Pollution Control Hearings Board regarding the expansion of Seattle-Tacoma International Airport. The group argues that state regulators improperly allowed the Port of Seattle to rely on future, unwritten stormwater permits as proof that airport runoff would meet water quality standards, and that regulators wrongly pre-authorized pollution mixing zones in nearby waterways without sufficient oversight. The case centers on whether proper environmental protections were in place before approving the airport expansion project.
    TagsCitizens Against Sea-Tac Expansion, Clean Water Act, PCHB, Pollution Control Hearings Board, RCAA, StormwaterFolderRCAA
  • 2022-09-12

    Conditions accepted and appealed summary table

    This document lists 16 permit conditions related to environmental protections at what appears to be a Port development project, showing which conditions were accepted and which were appealed. Conditions covering stormwater management, wetland mitigation, fill criteria, and water quality monitoring were contested, with 8 of the 16 conditions formally appealed. Accepted conditions include stormwater sampling, wetland hydroperiod matching, and long-term contamination monitoring requirements.
    TagsMTCA, PCHB, Port Of Seattle, RCAA, Stormwater, Water QualityFolderRCAA

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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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