TagACC(1534)

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

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 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,

Comprehensive Stormwater Management Plan (SMP) prepared by Parametrix, Inc. for the Port of Seattle, Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements, December 2000, project number 556-2912-001(28). Document includes a July 2001 preface with replacement pages developed in response to Washington State Department of Ecology (Ecology) comments on Volumes 1 through 4. Covers stormwater management,

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 assesses the impact of Seattle-Tacoma International Airport's Master Plan Update improvements on Pacific Coast salmon Essential Fish Habitat (EFH) in nearby waterways, including Miller Creek, Des Moines Creek, and the Green River Basin. Prepared by Parametrix, Inc. for the Federal Aviation Administration and the Port of Seattle, it evaluates water quality, aquatic habitat, and hydrological effects of airport expansion on local salmon species such as Chinook, Coho, and Pink salmon. The report also outlines conservation and mitigation measures proposed to offset adverse effects on salmon habitat in the airport's surrounding watersheds.

Final Natural Resource Mitigation Plan prepared by Parametrix, Inc. for Port Of Seattle, Seattle-Tacoma International Airport Master Plan Update Improvements, December 2000 (AR 048591, project 556-2912-001). Covers wetland delineation and descriptions, Miller Creek Basin, Des Moines Creek Basin, Gilliam Creek, South Aviation Support Area (SASA), runway safety area extensions, South 154th Street relocation, on-site borrow

The Industrial Wastewater System (IWS) at Seattle-Tacoma International Airport was built in 1963 to collect and treat runoff from airport aprons, taxiways, hangars, and maintenance areas that may be contaminated by fuel spills, de-icing chemicals, and aircraft wash water. The system channels wastewater through two main drainage areas to an on-site treatment plant, with treated water ultimately discharged into Puget Sound under an NPDES permit. Ongoing upgrades aim to expand the system's capacity to handle a 25-year design storm event.