Notes

Technical memorandum from Harris Miller Miller & Hanson Inc. (HMMH), authored by Eric Cox, to Julie Kinzie at Sea-Tac Airport (SEA), reporting acoustical testing results for the SEA Repair and Replacement Program conducted in August 2025. Covers median interior Day-Night Average Sound Level (DNL) measurements for 31 residential structures in SeaTac, Burien, and Des Moines located within the 65–70 dB noise contour interval per the 2018 Forecast Condition Noise Exposure Map (NEM). Testing used HBK Model 2245 sound level meter, Mackie SRM450 loudspeaker (pink noise), and Boeing 737-800 representative aircraft spectrum per FAA AC 150/5000-9B Section 8.5.10.1. One structure meets the 45 dB median interior DNL threshold under FAA Order 5100.38D Appendix R; seven additional structures have individual rooms above 45 dB. Addresses on 13th Ave S and 14th Ave S in SeaTac and Des Moines, and 16th Ave S in Burien. HMMH Project Number 03-12150.001.004.

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StART SEA Stakeholder Advisory Round Table
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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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Meeting Agenda 10:00 a.m. – 10:15 a.m. | Welcome – Evan Nordby, Chair a. Introductions and Agenda Reviewb. Status of appointments and non-voting member invitationsc. Other updates as necessary 10:15 a.m. – 11:00 a.m. | Is it practical and legal to operate the western Washington [Puget Sound] airports as a single airport system? – Consultant
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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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