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  • 2025-11-15 01:07

    Sea-Tac Airport Part 150 Study Virtual Public Workshop Transcript

    Hello and welcome to the virtual public workshop for the Part 150 study for Seattle-Tacoma International Airport. We appreciate you attending this workshop today and your participation and input is a key component of this study. This series of workshops is a continuation of the in-person workshops that were held starting on September 30th. Today
  • 2025-10-15 00:47

    Sea-Tac Airport Part 150 Full NEM Virtual Workshop Recording

    JENNY THACKER (PRR, Virtual Meeting Facilitator): All right, welcome everybody to the Part 150 study for Seattle Tacoma International Airport virtual public workshop. I’m Jenny Thacker from PRR and I’ll be your virtual meeting facilitator this evening. All participants are automatically muted upon arrival and will remain muted through the entire meeting and those who
  • 2025-08-12 22:32

    ESA Webinar on recent NEPA policy changes

    So many lemons. Maybe some lemonade? Environmental Science Associates (ESA) held a webinar today to provide an overview and meaning to the truly astounding number of policy changes affecting NEPA over the past two years. Although an ‘overview’, the NEPA process is so technical the video may be of interest only to specialists. However, we
  • 2019-01-12 09:00

    Noise 101 Symposium

    • Welcome/Review of the Syllabus 9:00 – 9:10 am • Module 1: Principles of Aviation Noise 9:10 – 9:45 am • Module 2: Quantifying Aircraft Noise 9:45 – 10:30 am • 10-minute Break • Module 3: Aircraft Noise Regulations and Guidance 10:40 – 11:10 am • Module 4: Principles of Aircraft Noise Control 11:10 – 11:45 am • Wrap-up and Final Questions 11:45 – 12:00 pm Noise 101 Symposium City of SeaTac Port of Seattle Noise 101 Symposium Principles of Aviation Noise Presented by: Steve Alverson, ESA January 12, 2019 Principles of Aviation Noise Copyright 2019 Environmental Science Associates Principles of Aviation Noise • Acoustic principles • Propagation of sound • Noise metrics • Rules of thumb Principles of Aviation Noise Copyright 2019 Environmental Science Associates Acoustic Principles • Sound can be described in terms of its amplitude (pressure) and frequency (pitch) – Amplitude is a direct measure of the magnitude of sound without consideration for other factors that may influence the perception of it – Frequency is expressed as Hertz (Hz) or cycles per second Principles of Aviation Noise Copyright 2019 Environmental Science Associates Acoustic Principles • Amplitude – Sound pressure ranges are very large, therefore expressed on a logarithmic scale – The logarithmic scale compresses the wide range in sound pressures to a more mathematically useable range – Standard unit of measurement is the decibel (dB) Principles of Aviation Noise Copyright 2019 Environmental Science Associates The Decibel Scale Source: U.S. EPA Principles of Aviation Noise Copyright 2019 Environmental…
  • 2018-06-18 22:25

    Aircraft Noise 101 – Steve Alverson – Highline Forum

    An introduction to airport noise, DNL65 and Part 150 by Mr. Steve Alverson of ESA – the firm used by the Port of Seattle for the current Part 150 Study and SAMP