TagThird Runway(1098)

A February 2002 technical letter from GeoSyntec Consultants, written on behalf of the Airport Communities Coalition, raises concerns about the Port of Seattle's low flow analysis for the Sea-Tac Airport Third Runway expansion project. The letter argues that the Port's analysis fails to account for the years-long delay before water would flow through the new embankment fill into drainage systems feeding nearby creeks, potentially leaving those creeks without adequate water during the critical early years of operation. GeoSyntec concludes that the Port has not demonstrated the project's storage vaults are properly sized, and that the underlying computer models are unreliable due to lack of calibration and flawed assumptions about soil hydraulic conductivity.

A February 2002 technical letter from GeoSyntec Consultants, submitted to the U.S. Army Corps of Engineers on behalf of the Airport Communities Coalition, raises serious concerns about the Port of Seattle's water flow analysis for the Sea-Tac Third Runway expansion project. The report argues that the Port's analysis fails to account for the years-long delay before water would flow through the new embankment fill and reach surrounding creeks, potentially leaving those creeks without adequate water during the critical early years after construction. GeoSyntec concludes that the storage vaults designed to protect creek water levels are likely undersized and that the Port has not reliably demonstrated the project will meet low streamflow requirements.

A February 2002 technical letter from GeoSyntec Consultants, submitted to the U.S. Army Corps of Engineers on behalf of the Airport Communities Coalition, raises serious concerns about the Port of Seattle's water flow analysis for the proposed Sea-Tac Third Runway expansion. The letter argues that the Port's analysis fails to account for the years-long delay before water would flow through the new embankment fill into drainage systems, potentially leaving nearby creeks without adequate water during the critical early years of operation. GeoSyntec concludes that the storage vaults designed to protect creek water levels may be significantly undersized due to flawed modeling assumptions and an overestimation of how quickly water would move through the embankment soil.

This February 6, 2002 letter from Helsell Fetterman LLP transmits field notes from a January 28, 2002 site visit by wetlands experts Peter Willing and Bill Rozeboom, submitted as part of the legal case Airport Communities Coalition v. Ecology and Port of Seattle (PCHB No. 01-160). The handwritten field notes document observations of water resources, drainage structures, and site conditions at or near Sea-Tac Airport. The materials were shared with multiple parties involved in the Pollution Control Hearings Board proceeding.

Pollution Control Hearings Board (PCHB) case 01-160 denial of summary judgment filed by Airport Communities Coalition (ACC) against Washington State Department of Ecology and Port Of Seattle. ACC sought a ruling that Ecology’s §401 certification lacked reasonable assurance that Port Of Seattle had legal means to permanently mitigate low stream flow impacts of the Third

This legal document is a supplemental response filed by the Airport Communities Coalition (ACC) in a Washington State Pollution Control Hearings Board case against the Port of Seattle and the Department of Ecology. It lists scientific references and studies relied upon by ACC's expert witnesses, covering topics such as water quality, dissolved oxygen levels from runway de-icing at Seattle-Tacoma International Airport, and the effects of airport-related chemicals on aquatic life including salmon and trout. The document reflects ongoing litigation over the environmental impact of Sea-Tac Airport operations on surrounding waterways.

This document is a declaration by environmental scientist Dyanne Sheldon, submitted in support of the Airport Communities Coalition's motion for a stay in a Washington State Pollution Control Hearings Board case challenging permits issued to the Port of Seattle. Sheldon outlines her extensive background as a wetland ecologist and land-use planner, including her role in creating King County's pioneering wetland management program in the early 1980s. The case centers on a Section 401 Water Quality Certification and Coastal Zone Management Act concurrency statement issued to the Port of Seattle in connection with Sea-Tac Airport expansion activities.

This legal document is part of a Pollution Control Hearings Board case in which the Airport Communities Coalition (ACC) challenged the Port of Seattle and the Washington State Department of Ecology over environmental concerns related to Seattle-Tacoma International Airport. The document lists scientific references and studies relied upon by ACC's expert witnesses, covering topics such as the effects of airport deicing chemicals on water quality, dissolved oxygen levels in receiving streams, toxicity to aquatic life including salmon and trout, and fluoride impacts on fish. The referenced research was used to support ACC's claims about the environmental impact of airport operations on surrounding waterways and ecosystems.

This legal declaration by William A. Rozeboom, filed before Washington State's Pollution Control Hearings Board, challenges the Port of Seattle and the Department of Ecology over their environmental review of Sea-Tac Airport expansion. Rozeboom disputes the adequacy of water flow modeling used to assess impacts on Walker and Des Moines Creeks, argues that wastewater system effects on stream flow were improperly ignored, and contends that the proposed mitigation conditions in Ecology's 401 Certification are insufficient. He also challenges claims that the Port fully complied with King County's Surface Water Design Manual, noting the Port exempted itself from key drainage review requirements.

This document is a professional resume for W.A. Rozeboom, a civil engineer and hydrologist with 20 years of experience in water resources management, surface water hydrology, and hydraulic modeling. His work has focused primarily on flood control, stormwater management, floodplain mapping, and water rights administration in Washington State, Hawaii, and other regions. This document does not appear to contain content directly relevant to Sea-Tac Airport noise policy.