STIA Master Plan Update Final Supplemental EIS May,1997 Vol. 1 of 3 Main Appendix A-C1

Volume 1 - Main TextandAppendices A through C-1 - This statement is submitted for review pursuant to the requirements of Section 102(2)(C) of the National Environmental Policy Act of 1969 (42 U.S.C. 4321 et seq); E.O. 11990, Protection of Wetlands ; E.O. 11998, Floodplain Management; 49 USC Subtitle VII ; 42 U.S.C. 7401 et seq; Department of Transportation Act Section 4(f) 49 USC 303 (c ); 49 U.S.C. 47101 et seq; Washington State Environmental Policy Act (RCW 43.21C); and other applicable laws. This Supplemental Environmental Impact Statement (SEIS) is a combined National Environmental Policy Act and Washington State Environmental Policy Act (SEPA) document. With regard to SEPA requirements, this Supplemental EIS represents the third step of a phased environmental review which began with publication of the 1992 Flight Plan Final EIS, which assessed alternatives for addressing regional aviation needs , and the issuance of the Final EIS for the Master Plan Update. This Final Supplemental EIS also contains a final conformity analysis, as required by the Clean Air Act amendments. The Port of Seattle, operator of Seattle-Tacoma International Airport, has prepared a Master Plan Update for the Airport. The Plan shows the need to address the poor weather operating capability of the Airport through the development of an 8,500 foot long third parallel runway (Runway 16X/34X), separated by 2,500 feet from existing Runway 16L/34R, with associated taxiways and navigational aids. Other needs include: extension of Runway 34R by 600 feet; establishment of standard Runway Safety Areas for Runways 16R/L; development…
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