(Taken From Ch. 5, "Final Evaluation of Noise Abatement and Noise Remedy Measures" by Peat Marwick, const .. lltants to the Port.) 5. Acoustical treatment of existing structures. This measure was an integral part of the 1976 Sea-Tac/Communities Plan and should be retained. As mentioned in Chapter 2 of this report (p. 2-16), noise grid cells were primarily used to determine where and to what extent acoustical treatment and other remedy programs might be applied within the Airport Environs. However, noise contours were also used to ensure 5-8 DRAFT ,, .• that all possible eligible areas are covered by this and other noise remedy programs. Detailed evaluation of acoustical treatment as a noise remedy measure and its application within the Airport Environs has resulted in development of the following suggested · eligibility criteria for sound insulation: (a) Existing single-family structures located in areas with a noise exposure of Ldn 70 and above in 1980 (present condition-base year) or Ldn 65 and above in the year 2000. (b) Structures/uses identified under the sound insulation noise remedy program included as part of the Sea-Tac/Communities Plan. [Note: Criteria used in the original Sea-Tac/Communities Plan for acoustical treatment involved the ANE (adjusted . noise expo- sure) noise metric. The day-night level or Ldn metric is being used for this Noise Remedy Update Study, in accordance with national trends. A given ANE value such as ANE 40 can be converted to an equivalent <.:!:) Ldn value by adding 35; thus, Ldn 75 approximates ANE 40.…Open full document
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This document outlines noise remedy measures for Sea-Tac Airport, specifically focusing on acoustical treatment of existing structures. It details eligibility criteria for sound insulation programs, including structures in areas with noise exposure of Ldn 70 and above, and discusses the evolution from the 1976 Sea-Tac/Communities Plan to updated noise metrics and program boundaries.