TagPort Of Seattle(2403)

Email from Chung K. Yee to Kevin Fitzpatrick (cc: Craig E. Thompson, Ann Kenny), dated June 26, 2001, transmitting draft clean fill criteria language for the 401 Certification related to the proposed Third Runway embankment at Sea-Tac Airport. Fill criteria based on Method A table, 3-phase model protection of ground water and surface water, PQL,

Email dated June 26, 2001 from Chung K. Yee to Craig E. Thompson and Kevin Fitzpatrick (Ecology) transmitting draft fill criteria requirements for the 401 Water Quality Certification for the SeaTac Third Runway Embankment project. Attachments include: draft clean fill criteria, spreadsheets deriving surface water quality criteria and ground water cleanup levels using three-phase model

A June 2001 technical memo from Pacific Groundwater Group to the Port of Seattle outlines groundwater modeling work related to the proposed Sea-Tac Airport third runway construction. The memo defines areas to be analyzed using Hydrus/Slice modeling software instead of the standard HSPF model, focusing on how new runway fill in the Miller Creek and Walker Creek basins will affect groundwater recharge. It also describes the selection of three representative hydrogeologic cross sections and methods for calculating effective recharge, accounting for runoff from impervious runway surfaces into surrounding pervious fill areas.

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.

Final meeting notes prepared by Kate Snider of Floyd & Snider Inc. for the 401 Permit Decision-Making process for the Sea-Tac International Airport Third Runway project, covering Low Flow Analysis discussions held June 25, 2001. Attendees included representatives from Washington State Department of Ecology (Ann Kenny, John Drabeck), King County (Kelly Whiting), Port of Seattle

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.

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

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

Letter dated June 21, 2001 from Jeannie Summerhays (Washington Department of Ecology, Northwest Regional Office) and Elizabeth Leavitt (Port Of Seattle, Aviation Environmental Programs, Seattle-Tacoma International Airport) to Tom Mueller, Chief, Department of the Army Corps of Engineers, Seattle District, Regulatory Branch. Pursuant to 15 CFR § 930.60, Ecology and the Port Of Seattle mutually

Record of telecon dated 6-21-01, call from Ann Kenny. Notes that Port has agreed to pay for new scope and minor plan sheet changes. Jim to be given confirmation in writing. July 9th Low Flow meeting scheduled. Parametrix involvement noted — panel 6 may be larger with potential impact. Meeting with Corps to be set