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Sea-Tac Airport Noise Monitoring System Report: January–February 1980

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A March 1980 internal memo from Bob Wells of the Planning department transmits Noise Monitoring System reports for January and February 1980 to Marion MacKenzie, noting that the station map quality is poor while a clearer version is being prepared. The accompanying report for Sea-Tac International Airport shows monthly and long-term average Day-Night Sound Level (LDN) readings across nine remote monitoring stations, with January 1980 values ranging from 73 to 84 dBA. Operational notes indicate that 58% of January air traffic flew north to south, heavy snowfall forced a brief airport closure on the 8th–9th, and two minor clock failures in the monitoring system were corrected without any loss of noise data.

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Notes

Memo dated March 14, 1980 from Bob Wells, Planning (ext. 587-5312) to Marion Mackenzie transmitting noise level reports for January and February 1980 from the Sea-Tac International Airport Noise Monitoring System. Includes noise measurement definitions covering the decibel scale, LDN (Day-Night Sound Level), LEQ (Equivalent Noise Level), and A-weighted decibels (dBA). January 1980 monthly LDN averages by remote monitor station (stations 1–9) range from 73–84 dBA, with long-term averages (July 1979–January 1980) of 72.6–84.6 dBA. Operation notes indicate 58% of January air traffic flow was north to south; heavy snowfall closed the airport on the 8th–9th. Map of remote monitoring station locations near Des Moines, SeaTac, and surrounding communities included.

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