In September 2003, the Port of Seattle Commission considered authorizing a $3.69 million program to sound-insulate 98 single-family homes near Sea-Tac Airport that fell within the projected 2010 65 DNL noise contour and were built before local noise codes took effect. The project, stemming from a 1997 Environmental Impact Statement related to the airport's third runway, aimed to reduce interior noise levels by at least 5 decibels in eligible homes in Des Moines and unincorporated King County. Funding was to come primarily from federal Airport Improvement Program grants (80%), with the remainder drawn from the Airport Development Fund, and homeowners were required to grant the Port an avigation easement in exchange for the insulation work.Open full document
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This Port of Seattle memorandum requests authorization for executives to execute documents implementing sound insulation of 98 single-family residences located in the 2010 65 DNL noise contour, affected by a 1.5 DNL or greater noise increase from the 3rd runway operations. The estimated total project cost is $3,692,914, with 80% eligible for federal Airport Improvement Program funding. The project objective is to reduce interior noise levels by a minimum of 5 decibels in qualifying homes built before December 3, 1986 (Des Moines) or September 6, 1987 (King County).