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RESPONSE TO COMMENTS: <br />Metropolitan Council - 8/15/85 and Staff Letter 7/30/85 <br />Comment - The need for a quantitative noise analysis/land use <br />cgmpatibility and consistency with MC policies 4 and 6. <br />Response - Environmental guidelines do not require a noise analysis <br />based on the forecast activity levels at Gateway. A quantitative <br />analysis would not be required until annual operations reach 90,000 or <br />700 annual jet operations. No sensitive or controversial sites are <br />expected to be impacted. We have, however, anticipated that noise <br />would be an issue but primarily from a perceived not a quantitative <br />viewpoint. From our experience with other airports with similar <br />characteristics, it is our opinion that all significant noise (greater <br />than 65 ldn)-will be closely associated with the runway and contained <br />within airport boundaries. <br />A comparison with Hartford Municipal Airport (WI) which had opera- <br />tional characteristics in 1979 similar to those proposed at Gateway <br />for 2005 provides an approximation of anticipated noise impacts: <br />Comparison of Activity Characteristics and Noise Analysis <br />for the Years 1979 and 2005 <br />HARTFORD MUNICIPAL AIRPORT GATEWAY NORTH <br /> Existing 1979 Forecast 2005 <br />Runways 1'_-29 18-36 16-34 <br />Runway characteristics Paved 3000' Sod 2300' Paved 3300' <br />Runway Utilization 85$ 15~ 100 <br />Individual Runway 11-34$ 18-71& 16-50~ <br />Utilization 29-66~ 36-29~ 34-50$ <br />Annual Operations 40,036* 36,900 <br />Percent Twin Engine <br />& Turbo Prop Ops. 9.5& 10$ <br />Percent Jet Operations 0$ 0$ <br />_ Percent Night Ops. <br />(10:00 p.m. - 7:00 a.m.) 5~ 5$ <br />-- *40,036 x .85 (i1-29 runway utilization) = 34,030 operations on paved <br />runway <br />