TagThird Runway(1098)

Memorandum from Reese P. Hastings and Michael J. Bailey, P.E., Hart Crowser, Inc. to Ralph Wessels, Port Of Seattle, dated December 8, 2000, quantifying potential impacts to wetland resources from development of Borrow Areas 1, 3, and 4 and an on-site haul route for the Third Runway embankment at Sea-Tac Airport. Document J-4978-62 details 17

Floyd & Snider Inc. meeting notes summary covering Sea-Tac Airport Third Runway 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology), October 2 through December 8, 2000. Documents master list of 401 Permit technical issues including Stormwater Master Plan detention sizing, basin acreage discrepancies, HSPF and KCRTS hydrological models, IWS

This document summarizes technical negotiation meetings held between October and December 2000 regarding a 401 Water Quality Permit for the Port of Seattle's proposed third runway construction at Sea-Tac Airport. The discussions focused on resolving stormwater management issues, including detention pond sizing, basin hydrology, wetland impacts, and compliance with environmental regulations. A master list of technical issues was maintained jointly by the Port and the Washington State Department of Ecology to track the resolution status of each item prior to permit issuance.

Floyd & Snider Inc. meeting notes summary covering 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology) regarding the Sea-Tac Airport Third Runway and Stormwater Master Plan Update, October 2 through December 8, 2000. Document covers wetland issues only and includes a master list of 401 technical issues with resolution

A fisheries biologist hired by the Airport Communities Coalition reviewed the Port of Seattle's permit application for the Miller Creek Relocation Project, raising serious scientific concerns about the proposed construction near Sea-Tac Airport. The review found that the project design lacked supporting scientific citations and calculations, and concluded that summer water temperatures would likely exceed safe levels for cutthroat trout for several years until riparian vegetation matured. Additional concerns were raised about inadequate water flow depths and the risk of the stream running dry due to highly porous spawning gravels used in the channel design.

A December 7, 2000 letter from the Port of Seattle to the Washington Department of Ecology responds to questions raised at a November 16, 2000 meeting regarding the Seattle-Tacoma International Airport Ground Water Study conducted under Agreed Order #97TC-122. The letter addresses the completion status of various research tasks, including hydrogeological surveys, contamination site identification, groundwater flow modeling, and pollution prevention for underground storage tank systems. The Port agrees with some of Ecology's assessments of incomplete tasks while disputing others, and clarifies its position on the scope of work required under the agreement.

Hart Crowser draft geotechnical engineering report (J-4978-28) prepared for HNTB, December 4, 2000, addressing the Third Runway embankment at Seattle-Tacoma International Airport, SeaTac, Washington. Covers embankment fill materials, slope stability analyses, foundation instability, subgrade improvements, liquefaction analysis (175-year and 475-year seismic events), FLAC deformation modeling, MSE walls (North Satellite Area, West, South), Phase 4 fill,

Wetland Delineation Report prepared by Parametrix, Inc. for Port Of Seattle, Seattle-Tacoma International Airport (Sea-Tac Airport), December 2000, project number 556-2912-001 (41). Report covers wetland delineation for Master Plan Update Improvements including North Employee Parking Lot, Runway Safety Area Extension, Third Runway project area, Borrow Areas 1 and 3, South Aviation Support Area (SASA)/Tyee Valley

Wetland Functional Assessment and Impact Analysis prepared by Parametrix, Inc. for Port Of Seattle, Seattle-Tacoma International Airport, December 2000 (project number 556-2912-001). AR 048122. Covers wetland delineation, functional assessment, and impact analysis for Master Plan Update Improvements including Runway Safety Areas, relocation of South 154th Street, new Third Runway, borrow areas, and South Aviation Support

This December 2000 report by Parametrix, Inc. for the Port of Seattle presents a Comprehensive Stormwater Management Plan for Master Plan Update improvements at Seattle-Tacoma International Airport. It maps the airport's drainage basins, surrounding watersheds (including the Duwamish River, Des Moines Creek, and Miller Creek watersheds), and identifies pollution-generating and non-pollution-generating surfaces across the airport property. The plan outlines water quality treatment strategies for existing and proposed impervious surfaces to manage stormwater runoff from airport operations.