Notes

Technical memorandum from Harris Miller Miller & Hanson Inc. (HMMH), authored by Eric Cox, to Julie Kinzie at Seattle-Tacoma International Airport (SEA), dated June 5, 2026. Reports acoustical testing results for 30 residential structures in the SEA Repair and Replacement Program conducted in April 2026. Measures median interior Day-Night Average Sound Level (DNL) using Noise Level Reduction (NLR) methodology per FAA Advisory Circular AC 150/5000-9B and FAA Order 5100.38D AIP Handbook Appendix R. Exterior DNL of 70 dB assigned per 2018 Forecast Condition Noise Exposure Map (NEM). Four structures met the 45 dB median interior DNL qualification threshold; 16 structures had one or more habitable rooms above 45 dB. Addresses in SeaTac, Des Moines, Seattle, and Burien tested. Representative aircraft: Boeing 737-800. Equipment: HBK Model 2245 sound level meter, HBK Model 4231 calibrator, Mackie SRM450 loudspeaker. HMMH Project Number 03-12150.001.004.

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Meeting Objectives Introduce the primary feedback themes identified by StART members regarding StART’s Operating Procedures and determine areas that may warrant future discussion. 5:00 PM – Welcome Meeting Management Welcome Lead: Andrés Mantilla, Facilitator, Uncommon Bridges; Wendy Reiter, Airport Managing Director, POS 5:15 PM – Dinner: All participants eat. 5:30 PM – StART Operating Procedures
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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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