Notes
Letter dated December 17, 1981, from Mark A. Beisse, Acting Chief, Planning and Programming Branch, ANW-610 (FAA Northwest Mountain Region), to Jody Yamanaka, Department of Planning and Research, Port of Seattle, summarizing FAA major review comments on the draft Sea-Tac Noise Exposure Update Report (dated November 1981). Comments address deficiencies across multiple project phases: Phase II Task B (flight track variance range), Phase II Tasks D and E (INM verification and accuracy comparison between INM and NMS, flow directions, NEL adjustments), Phase III Task B (portable noise meter verification, low frequency noise and vibration), Phase III Task C (noise abatement application at Sea-Tac compared to other airports), Phase IV Task A (range of estimates for operations growth and fleet mix, pessimistic/nominal/optimistic noise impact contours), Phase IV Task C (Ldn calculation for airport taxiing noise, ambient noise levels, meteorological data, sensitivity analysis), Phase IV Task D (survey on population patterns and land use, 170 staff hours), and Phase VI Task B (PAC briefings and public meetings). The letter also questions whether consultants oversaw the entire study and support the findings.