Notes
SEPA Addendum dated January 24, 2000, Port Of Seattle, POS SEPA No. 00-02, addressing modifications to the Master Plan Update Development Actions for the Third Parallel Runway at Seattle-Tacoma International Airport. Addendum covers: (1) increased wetland acreage affected by the project, revised from 12.23 acres to 18.33 acres, with 15.41 acres affected by the runway including embankment borrow sources and off-site mitigation, 0.14 acres by Runway Safety Areas, and 2.78 acres by South Aviation Support Area (SASA) improvements; (2) design changes to the MSE (Mechanically Stabilized Earth) retaining wall for the runway embankment; and (3) noise and vibration analysis for the temporary construction-only interchange at SR 509/South 176th Street used for fill haul trucks. Contacts: David McCraney (Environmental Program Manager) and Michael Cheyne (Project Manager). References 1996 FEIS, 1997 FSEIS, and 1996 JARPA (Joint Aquatics Resources Project Application). Mitigation includes a noise attenuation wall, offer to acquire and relocate one residence at SR 509/S. 176th Street overpass northwest corner, and sound insulation for affected homes per WSDOT standards.