TagSea-Tac Airport Master Plan(37)

This draft report from the City of Burien analyzes environmental impacts of proposed updates to the Seattle-Tacoma Airport Master Plan, covering noise and vibration, air quality, water resources, and visual aesthetics. The study found that while the airport's Environmental Impact Statement used accepted noise modeling methods, several gaps remain — including the need for better data on aircraft noise levels, surface traffic noise, and vibration effects on nearby residents and buildings. Mitigation measures to address these issues will be developed in a separate follow-up report.

Passed before 3rd Runway

Port Of Seattle Commission Resolution No. 3212, As Amended, adopting the Airport Master Plan Update for Seattle-Tacoma International Airport (STIA), approving development of a new 8500-foot dependent air carrier runway with centerline located no further than 2500 feet west of runway 16L/34R, and committing to additional noise reduction measures per Puget Sound Regional Council Resolution

Attachment D table summarizing wetland mitigation credit for Seattle-Tacoma International Airport Master Plan Update improvements. Documents in-basin mitigation (102.27 acres, 29.80 credit) and out-of-basin mitigation (65.38 acres, 42.91 credit) for a total of 167.65 mitigation acres and 72.71 total credit. In-basin mitigation includes wetland restoration at Vacca Farm (credit ratio 1:1), wetland enhancement at Vacca

This section of the Sea-Tac Airport Master Plan Update Environmental Impact Statement examines how proposed airport expansion alternatives would affect water quality and hydrology in the surrounding area, particularly Miller Creek and Des Moines Creek. The analysis finds that increased impervious surfaces would raise stormwater runoff volumes and peak flow rates, potentially causing downstream flooding and erosion, but that required detention storage facilities and mitigation measures would largely prevent significant water quality degradation. Both creeks, while classified as Class AA extraordinary waters, already show some pollution from urban stormwater runoff, though deeper regional groundwater used for drinking remains unaffected.

Exhibit 175 (AR018443) summarizes wetland mitigation credit for Sea-Tac Airport Master Plan Update improvements. Tables detail in-basin mitigation (102.27 acres, 29.80 credit) and out-of-basin mitigation (65.38 acres, 42.91 credit) for a total of 167.65 acres and 72.71 mitigation credits. Specific mitigation sites include Vacca Farm, Miller Creek Wetland and Riparian Buffer, Tyee Valley Golf Course,

Declaration of Gina Marie Lindsey, Director of Seattle-Tacoma International Airport (STIA) since September 1993, submitted in Pollution Control Hearings Board (PCHB) Case No. 01-0133, Airport Communities Coalition v. Department of Ecology and Port of Seattle. Lindsey describes STIA deficiencies including airside delays during poor weather, inadequate parking, inadequate road access for south airport traffic, and

Facsimile cover sheet dated 2-19-02 from Ray Hellwig, Washington State Department of Ecology Northwest Regional Office (Bellevue, WA), to Tom Young (AAG), transmitting 11 pages including a Port of Seattle memorandum dated February 7, 2002 and an Inter-local Agreement between State of Washington Department of Ecology and Port of Seattle for oversight of construction projects

Parametrix, Inc. technical memorandum dated January 21, 2002, from Jim Kelley, Ph.D., to Muffy Walker, US Army Corps of Engineers Regulatory Branch, regarding Port Of Seattle permit 1996-4-02325 (Sea-Tac Airport Master Plan Update). Provides supplemental information on wetland impacts in upper watersheds of Miller Creek, Walker Creek, and Des Moines Creek, including percent loss of

Natural Resource Mitigation Plan for Seattle-Tacoma International Airport (STIA) Master Plan Update, November 2001, document reference 556-2912-001 (03). Table 1.3-1 lists all proposed Master Plan Update improvement projects including: third parallel runway 16X/34X (8,500 ft), Runway Safety Areas (RSAs) for 16R/34L and 16L/34R, South 154th Street relocation, South Aviation Support Area (SASA) for cargo/maintenance, embankment