April 5, 2001August 2, 2026

EXH AR028405: Port Of Seattle Master Plan Update — Wetland Functional Analysis, Wetlands A6-A7-A8, A12-A13-A18

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Parametrix, Inc. wetland functional analysis forms prepared for the Port Of Seattle Master Plan Update, documenting wetland attributes for wetlands A6-A7-A8 and A12-A13-A18, dated 4/5/01, investigator W.K./Mil. Records presence/absence of wetland attributes including vegetation classes (Cowardin), forested wetland coverage (80%, 30%), impervious surface (>60% urban/runway), buffer conditions, seasonal ponding, emergent vegetation, seeps and springs, flooding frequency, organic soils, clay/till substrate, and water depths (seasonal 3-5 inches). Notes low-density residential adjacency, seasonal saturation to surface, Berm Garden Drainage structure, and septic leach field impacts. AR 028405-028407.

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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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