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EXH 261: Biological Assessment — Master Plan Update Improvements, STIA

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Sea-Tac Airport
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This June 2000 Biological Assessment, prepared by Parametrix, Inc. for the Federal Aviation Administration and Port of Seattle, evaluates the potential environmental impacts of proposed Master Plan Update Improvements at Seattle-Tacoma International Airport on federally listed species. The report examines effects on aquatic resources including Chinook salmon, bull trout, and their critical habitats within nearby waterways such as Miller Creek, Des Moines Creek, and the Green River. It was prepared to support Section 7 consultation under the Endangered Species Act with the U.S. Fish and Wildlife Service and National Marine Fisheries Service.

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Biological Assessment (BA) prepared by Parametrix, Inc. for the Federal Aviation Administration (FAA) and Port Of Seattle regarding Master Plan Update Improvements at Seattle-Tacoma International Airport (STIA), dated June 2000 (AR 019259). Filed as Exhibit 261 in PCHB proceedings. Addresses ESA-listed species managed by USFWS and NMFS including Chinook salmon, bull trout, and Essential Fish Habitat. Evaluates hydrologic systems including Miller Creek, Walker Creek, Des Moines Creek, Green River/Duwamish River, and the Auburn Wetland Mitigation Site. Covers Puget Sound Regional Council action area, critical habitat designations, Puyallup River Basin Chinook salmon, Green/Duwamish River wild and hatchery fish, and Pacific Coast groundfish. Supports reinitiation and initiation of Section 7 ESA consultation. Document number 556-2912-001(48).

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