A standard audio engineering graph showing the frequency response curves for A-weighting (blue), B-weighting (yellow), C-weighting (red), and D-weighting (black) filters, plotted as Gain in dB versus frequency from 10 Hz to 100 kHz. A red arrow highlights the low-frequency region (~50-80 Hz) where the curves diverge most significantly, particularly relevant to aircraft noise assessment where D-weighting was developed specifically for aircraft noise measurement.

Notes

Graph of common acoustic weight curves with arrow highlighting that A-Weighting minimizes the impact of low frequency sound by a factor of four!

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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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