TagThird Runway(1098)
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2001-06-25EXH 234: NHC Follow-Up Comments Stormwater Hydrology Hydraulics Proposed Third Runway STIA Corps Ref. 1996-4-02325
Northwest Hydraulic Consultants submitted follow-up technical comments to the U.S. Army Corps of Engineers and Washington State Department of Ecology regarding stormwater, hydrology, and hydraulics concerns related to the proposed third runway at Seattle-Tacoma International Airport. The letter, written on behalf of the Airport Communities Coalition, challenges the Port of Seattle's responses to earlier criticisms, raising unresolved issues about stormwater management standards, independent design review, cost estimates for detention facilities, and the accuracy of hydrological modeling. Key concerns include ambiguity in which stormwater standards will apply, inadequate quality assurance processes, and inconsistencies in the project's Stormwater Management Plan. -
2001-06-25EXH 304: Final Meeting Notes — Low Flow Analysis, 401 Permit, STIA Third Runway (Jun 25, 2001)
These are meeting notes from a June 25, 2001 technical meeting regarding the 401 Permit Decision-Making process for the Sea-Tac International Airport Third Runway project, focused on analyzing low stream flow impacts. Participants from the Department of Ecology, King County, Port of Seattle, and various consulting firms discussed methodologies for evaluating water flow modeling results, vault filling estimates, and potential mitigation requirements for affected streams. Modeling results were not yet available at the time of the meeting, and a follow-up meeting was scheduled for July 9, 2001 to review completed modeling output and determine any required mitigation measures. -
Sea-Tac Airport Aerial View Showing Parallel Runways, Terminal Complex, and Seattle Skyline
Aerial photograph looking northward over Seattle-Tacoma International Airport showing the parallel runway configuration, terminal complex with aircraft at gates on the right, and the downtown Seattle skyline visible in the upper left background. The image appears to date from a period when the third runway (center-left) was under construction or newly completed, consistent with Sea-Tac's mid-to-late 1990s or early 2000s expansion era. -
2001-06-22Aerial View of Third Runway Construction at Sea-Tac Airport
Aerial photograph looking north toward Seattle-Tacoma International Airport, showing active runway construction and grading work on what appears to be the third runway project area. The main terminal, control tower, and existing parallel runways are visible in the background, with construction equipment and disturbed earth in the foreground adjacent to residential and forested areas to the south. -
2001-06-22EXH AR021830: GeoSyntec Letter — ACC Response to Comments, West MSE Wall Seismic Stability, Third Runway
GeoSyntec Consultants, hired by the Airport Communities Coalition, wrote to the U.S. Army Corps of Engineers and Washington State Department of Ecology in June 2001 raising serious technical concerns about the proposed Third Runway Expansion at Seattle-Tacoma International Airport. The letter challenges the Port of Seattle's geotechnical analysis for the West Mechanically Stabilized Earth (MSE) Wall, arguing that soil strength testing was insufficient, the extent of liquefiable material may have been underestimated, and seismic stability analyses were being performed incorrectly. GeoSyntec concluded that the Port had not yet demonstrated the wall could be safely and economically constructed to withstand potential seismic loads without unacceptable deformation. -
2001-06-22Exhibit 2043: TCP Recommendations for 401 Certification and Analysis of Preferential Ground Water Flow Paths Relative to Proposed Third Runway, STIA
Memo dated June 22, 2001 from Ching-Pi Wang (Toxics Cleanup Program, TCP) to Ann Kenny regarding TCP recommendations for 401 certification related to the proposed Third Runway at Seattle-Tacoma International Airport (STIA). Three recommendations: (1) Port of Seattle to develop a plan by September 14, 2001 to monitor contaminant transport to soil and groundwater via -
2001-06-22Exhibit 73: TCP Recommendations for 401 Certification — Port Of Seattle Third Runway
Memorandum from Ching-Pi Wang to Ann Kenny (cc: Ray Hellwig, Roger Nye, John Wietfeld, Steve Alexander) dated June 22, 2001, outlining Toxics Cleanup Program (TCP) recommendations for 401 certification related to the Port Of Seattle Third Runway project. Three recommendations: (1) Port Of Seattle to develop a plan by September 14, 2001 to monitor contaminant -
2001-06-22Aerial View of Sea-Tac Airport Third Runway Construction, Des Moines Creek Wetlands, and SR-99
Aerial photograph looking north showing Seattle-Tacoma International Airport's runway infrastructure under construction (likely the third runway project, completed 2008) in the upper left, with the Des Moines Creek wetlands area in the center, and a multi-lane highway (SR-99/Pacific Highway South) crossing the foreground. Puget Sound and forested residential areas are visible on the right horizon. -
2001-06-22Aerial View of Sea-Tac Airport Third Runway Construction and I-5 Corridor
Aerial photograph looking north toward Seattle-Tacoma International Airport (Sea-Tac), showing the airport's runway complex in the upper left and what appears to be active grading and construction work consistent with the third runway project (completed 2008). A multi-lane highway (Interstate 5) runs diagonally across the middle of the frame, with residential areas and Puget Sound visible in the distance to the right. -
2001-06-19EXH AR17302: Email Chain RE: Acceptable Fill Criteria Language for Draft 401 Certification
Email chain (AR017302) among Washington State Department of Ecology staff Chung K. Yee, Kevin Fitzpatrick, Craig Thompson, and AAG Joan Marchioro regarding acceptable fill criteria language for the Draft 401 Water Quality Certification for the Seattle-Tacoma International Airport Third Runway project. Key issues include: whether Ecology’s 401 WQ Certification fill criteria should ‘stand alone’ from