APPENDIX G - Future 2021 NEM NCP

Landrum & Brown Team Appendix G – Future (2021) NEM/NCP Noise Contour October 2013 Page G-1 APPENDIX G FUTURE (2021) NOISE EXPOSURE MAP/ NOISE COMPATIBILITY PROGRAM A Future (2021) noise exposure contour was prepared to understand potential noise impacts within the ten-year timeline for planning purposes. The Future (2021) Noise Exposure Map/Noise Compatibility Program (NEM/NCP) represents the anticipated noise levels for a typical day in 2021, with the implementation of all recommended noise abatement measures. The Future (2021) NEM/NCP was prepared using the Federal Aviation Administration’s (FAA’s) Integrated Noise Model (INM) Version 7.0b. Noise exposure contours were prepared at levels of 65, 70, and 75 Day-Night Average Sound Level (DNL). This appendix presents the methodology and input data used to prepare the Future (2021) NEM/NCP for Seattle-Tacoma International Airport (Sea-Tac Airport). G.1 NOISE MODELING METHODOLOGY Number of Operations and Fleet Mix The number of operations included in the Future (2021) NEM/NCP is based on the Forecast of Aviation Activity prepared for this Part 150 Study. The forecast is based upon aviation industry trends and specific airline activity at Sea-Tac Airport. More information about this forecast is included in Chapter Two, Forecast. The Future (2021) condition includes 419,597 annual operations or 1,149.58 average-annual day operations, a projected increase of 15.4 percent from the Future (2016) Baseline operating levels. Table G-1, Distribution of Average Day Operations by Aircraft Type Future (2021) NEM/NCP, provides a summary of the average daily operations and fleet mix at Sea-Tac Airport, organized by aircraft type, operation type,…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]