TagStormwater(373)
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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. -
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. -
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. -
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 -
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. -
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 -
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. -
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. -
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. -
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.