Notes
Exhibit 263 (AR 019387), prepared by Parametrix, Inc. for the Federal Aviation Administration (FAA) and Port Of Seattle, is a Pacific Coast Salmon Essential Fish Habitat (EFH) Assessment for the Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements, dated December 2000. The assessment evaluates EFH for Chinook, Coho, and Pink salmon in the Miller Creek Basin, Des Moines Creek Basin, Green River Basin (including Gilliam Creek and Auburn Wetland Mitigation Site), and IWS Outfall marine habitat. It analyzes effects of proposed airport actions on EFH including stormwater quality impacts from copper, zinc, propylene glycol, and ethylene glycol; aquatic habitat and hydrologic impacts; flow duration curves at SR 509; and conservation and enhancement measures including water quality mitigation and detention facilities. Filed in PCHB proceedings related to the STIA Third Runway EIS.