This document outlines a Neighborhood Impact Matrices framework used to assess environmental, transportation, and socio-economic effects of a proposed airport-related project on communities surrounding Seattle-Tacoma International Airport, including cities such as Burien, Des Moines, Federal Way, Normandy Park, and Tukwila. Each matrix evaluates impacts across four columns — Measure, Impact, Mitigation, and Cost — covering issues such as aircraft noise (DNL and SEL contours), air quality, surface and groundwater quality, wetlands, and floodplains. Proposed mitigations range from neighborhood buyouts at $760,000 per acre for areas within the 65 DNL contour to easement and insulation programs, stormwater management plans, and flight track modifications.Open full document
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This document presents a framework for assessing and evaluating project impacts on neighborhoods in cities including Burien, Des Moines, Federal Way, Normandy Park, and Tukwila, as well as Highline School District areas. Each neighborhood matrix covers environmental, transportation, and socio-economic impacts organized by measure, impact, mitigation, and cost. The environmental impacts tables detail noise and vibration, air quality, surface water quality, groundwater quality, wetlands, and floodplain measures with associated mitigation strategies and estimated costs.