TagAirport Noise Report(9)

Survey results from the Sea-Tac Communities Plan showing community responses to 11 different noise improvement program possibilities. The questionnaire asked residents about their preferences for noise mitigation solutions, whether they would remain in their homes, and what programs would best solve neighborhood problems.

Meeting minutes from a Policy Advisory Committee discussing the Sea-Tac/Communities Plan. Topics include stream quality improvements, sewer hookup requirements, sleep interference testing related to aircraft noise, and a Bi-Centennial Project proposal for the Burien area.

A weekly update on litigation, regulations, and technological developments Volume 34, Number 33 October 7, 2022 In This Issue… Litigation … Port of Seattle is sued by attorney seeking to compel the disclosure of records discussing the nega- tive public health impacts from Seattle-Tacoma Interna- tional Airport operations, in- cluding from airport noise and pollution on those living within 10 miles of Sea-Tac - p. 132 REDAC … The Aviation-Im- pacted Communities Alliance urges FAA’s RE&D Advisory Committe to support six air- craft noise research propos- als the communities devel- oped to better understand and measure the impact of air- craft noise, especially from NextGen procedures. The community alliance will also seek to get their research projects included in the new FAA reauthorization bill now under development - p. 132 Electric Aircraft … Evia- tion’s nine-passenger Alice all-electric aircraft success- fully completes its first flight, which the company calls a major milestone in electric aviation - p. 134 (Continued on p. 133) (Continued on p. 133)

• Sound level decreases by 6 dB per doubling of distance • Additional losses due to atmospheric absorption Ground Effect: • Sound levels are lower when reflected off of soft ground vs. hard ground Sound Propagation Refraction due to Temperature: • Gradients in temperature cause the bending of sound paths • Sound bends upward during a temperature lapse (cool air over warm) • Sound bends downward during a temperature inversion (warm air over cool) Sound Propagation Refraction due to Wind: • Gradients in wind speed cause the bending of sound paths • Sound bends upward causing sound shadows in the upwind direction • Sound bends downward increasing sound levels in the downwind direction • Differences between upwind and downwind directions can be 20 dB Scope of Services ✓Ground Noise Data Research • Meet with StART • Identify ground noise sources and locations • Identify atmospheric conditions that may increase ground noise • Noise Monitoring (in progress – data acquisition complete) • Obtain and analyze data from permanent monitors • Collect and analyze additional temporary noise monitoring data • Identify Mitigation Options • Present findings on ground noise sources and levels and solicit input on mitigation measures • May include changes in aircraft operating procedures or utilization of new or existing structures to reduce community noise exposure • Report Project Results Noise Measurement Locations • Site 1: Northeast • Taxiing/queueing • Start-of-takeoff roll • Engine run-ups • Site 2: East • Terminal din • Auxiliary Power Units (APU) and taxi •…

A European research study examining the dose-effect relationships between aircraft noise, road traffic noise, and their combinations on reading comprehension and sustained attention in 9-10 year old children across the Netherlands, Spain, and the United Kingdom. The study found significant impairment in reading comprehension associated with aircraft noise exposure but no effects from road traffic