TagACC(1531)

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.

A February 2002 technical review by GeoSyntec Consultants, submitted to the U.S. Army Corps of Engineers, raises serious concerns about the Port of Seattle's low flow water analysis for the Sea-Tac Airport Third Runway expansion project. The review argues that the Port's models fail 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 of operation. GeoSyntec concluded that the proposed underground storage vaults may be significantly undersized and that the Port has not reliably demonstrated the project will meet required streamflow conditions.

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.

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

Letter dated February 5, 2002 from Hamid ‘Ed’ Abbasi, Environmental Engineer, Washington State Department of Ecology (NWRO) to Michael Feldman, Director of Aviation Facilities & Environmental Programs, Seattle-Tacoma International Airport. Ecology denies the Port Of Seattle’s request for an Administrative Order to bypass the industrial waste treatment system at Lagoon #3 under NPDES Permit WA-002465-1,

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.

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 2002 legal declaration by wetland scientist Dyanne Sheldon challenges the adequacy of environmental protections attached to a Washington State Department of Ecology water quality certification related to Sea-Tac Airport expansion. Sheldon argues that the groundwater and wetland performance standards required under the 401 Certification are too vague and scientifically flawed to reliably measure success or failure, citing problems such as undefined 'normal rainfall' baselines and an over-reliance on qualitative wetland plant ratings from the 1980s. The declaration was submitted in support of the Airport Communities Coalition's motion for a stay of the certification before the Washington Pollution Control Hearings Board.