Airport Improvement Program March 11, 1988

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, 1 1 1 1 The land use guidance chart presented in Table 2-2 relates LUG Zones to various aircraft noise estimating methodologies, HUD noise assessment guidelines, and suggested noise controls. LUG Zones A, B, C, and D, as shown, present four levels of airport noise impacts ranging from nominal for LUG A to severe for LUG D. The Department of Housing and Urban Development (HUD) Noise Assessment Guidelines are acceptability guidelines for site exposure to noise and are used for screening mortgaging guarantees and other HUD assistance. They are included for information and comparative purposes. The suggested noise controls are a generalized description of the land use control actions typically expected. Four scenarios were analyzed for noise impacts at Gateway North. The scenarios are based on airport activity forecasts developed in the Master Plan Study (1985). Aircraft operations have been selected for 1987 (base year), 1992 (5 year), 1997, (10 year) and 2005 (18 year). Although operations have been selected for these years, the actual noise impacts should be considered event oriented rather than time oriented (e.g., the noise map for 1982 depicts noise impacts associated with 22,000 operations regard- less of whether this occurs in 1989, 1992 or 1995). Table 2-3 outlines the major characteristics and assumptions for each scenario. Figures 2-1 through 2-4 illustrate the noise contours associated with each of the activity levels. The base year scenario (1987) uses the existing condition of the facilities with two landing strips, 16-34 and 9-27. The low utilization of Runway 9-27 combined with the low number of annual operations, however, are too low to develop even a minimal noise footprint. Future scenarios assume that the planned improvements have been implemented. They include a 16-34 paved 3300' runway and the closure of Runway 9-27. Note that in all scenarios, noise impacts are expected to be well within acceptable levels (refer to Table 2-2). Even under the 2005 year scenario, all noise levels above 60 Ldn would be contained within the boundaries of airport property and nearly all land exposed to 55 Ldn or greater will be contained on airport property. The Metropolitan Council's Noise Exposure Zones for Minor Airports are also based on Ldn values. Their classification system is as follows: Zone A B C D 70 Ldn & higher 65-70 Ldn 60-65 Ldn 55-60 Ldn Serious noise/exposure Nuisance Annoying Minimal 2-4