In this August 6, 1979 letter from the FAA's Northwest Region to Jongejan Gerrard Associates, the agency provides guidelines on acceptable crowd density levels for recreation planning near Sea-Tac Airport. The FAA outlines four zones around the runway, each with specific limits on peak-time people per acre, ranging from no intensive use in the clear zone closest to the runway to no more than 40 people per acre in outlying areas. The letter also discourages any recreation development that could create bird hazards, incompatible lighting, or electronic interference with airport operations.Open full document
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A letter from the FAA Northwest Region to Ms. Janis Snoey of Jongejan Gerrard Associates, Inc. providing guidelines on acceptable levels of public assemblies for the North Sea-Tac Recreation Planning project. The letter outlines density recommendations for four zones near the Sea-Tac Airport runway areas, including the clear zone and extended centerline areas. The FAA expresses preference for the ‘Modified Passive 2’ plan as the basis for further development of a final recreation plan.