This U.S. Army Corps of Engineers document reviews the environmental impact of construction projects at Seattle-Tacoma International Airport, including the Third Runway and related Master Plan Update improvements, focusing on impacts to wetlands and waterways. The Corps conducted an independent assessment of wetland functions and evaluated whether the Port of Seattle's proposed mitigation plans adequately compensated for the destruction or alteration of aquatic resources. After finding the Port's initial December 2000 mitigation plan insufficient, the Corps worked with the Port to develop a revised plan, accepted in November 2001, that better addressed the loss of wetland functions caused by airport construction.Open full document
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This document is the U.S. Army Corps of Engineers’ independent analysis and review of aquatic resource functions and potential project impacts related to the Third Runway and Master Plan Update Improvements at Seattle-Tacoma International Airport. It evaluates the adequacy of the Port of Seattle’s compensatory mitigation plans for impacts to wetlands and other waters of the U.S., including a review of the initial December 2000 Natural Resource Mitigation Plan and the revised November 2001 plan. The Corps conducted an independent Hydrogeomorphic functional assessment after finding the Port’s initial approach too general, ultimately determining the revised NRMP adequately addressed concerns.