July 23, 2001August 2, 2026

EXH AR050780: Assessment of the Existing and Future Hydrologic Divide of Miller, Walker, and Des Moines Creeks After Construction of Master Plan Update Projects at STIA

Notes

Parametrix, Inc. report prepared for Port Of Seattle assessing the existing (1994) and future (2006) hydrologic divide of Miller Creek, Walker Creek, and Des Moines Creek following Master Plan Update (MPU) construction at Seattle-Tacoma International Airport (STIA). Analyzes compliance with Governor’s Certification requirement that the third runway project will not cause changes in the location of the hydrologic divide between Miller and Des Moines Creeks that alter average instream flow. Tables A1 and A2 present watershed areas in acres for Des Moines Creek (1,679.7 to 1,587.6 acres), Miller Creek (1,277.2 to 1,236.6 acres), Walker Creek (233.7 to 234.0 acres), and Industrial Wastewater System (IWS) (291.4 to 423.7 acres). Includes drainage subbasin designations MC2–MC7, MC6B, MC7B, SDN3, SDN4, SDN3-X, SDN4-X, SDW-1A-I, SDW-1B-O, SDS3, SDS3A, SDS5, SDS6, SDS7 within the Comprehensive Stormwater Management Plan (SMP) STIA area. Project number 556-2912-001 (28). AR050780.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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