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<br />The input files contain operational data, runway utilization, aircraft flight tracks, and <br />fleet mix as projected in the plan. The operational data and aircraft fleet mix are <br />summarized in Table A. For more detailed information of the aviation forecasts for <br />San Marcos Municipal Airport refer to Chapter Two, Aviation Demand Forecasts. <br /> <br />TABLE A <br />Aviation Forecast Summary <br />San Marcos Municipal Airport <br />Type of Operation 1999 Long Term <br />ITINERANT OPERATIONS <br />Single Engine Piston 26,861 39,600 <br />Multi-Engine Piston 6,715 26,400 <br />Turboprop 2,000 4,000 <br />Business Jet 2,000 6,500 <br />Helicopter 1,500 4,500 <br />Total Itinerant 39,076 81,000 <br />LOCAL OPERATIONS <br />Single Engine Piston 51,520 90,800 <br />Multi-Engine Piston 12,880 22,700 <br />Total Local 64,400 113,500 <br />Total Operations 103,476 194,500 <br /> <br />Other important inputs into the program include the runway use percentages and <br />percentage of day and night operations. Three percent of all operations were assumed <br />to operate during night time hours. <br /> <br />The runway use percentages considered that Runway 12-30 was utilized by the <br />majority of medium and large aircraft, however, all other runways were assumed to be <br />utilized by corporate aircraft to a lesser degree. The ultimate noise contour reflects a <br />higher utilization ofthe Runway 17-35 by larger aircraft than assumed for the current <br />contour assuming reconstruction/extension occurs. It was assumed that the local, or <br />"touch-and-go" traffic was evenly distributed amongst all runways. <br /> <br />Results of the Noise Analysis <br /> <br />Considering existing operational activity, the 65 DNL noise contour encompasses <br />approximately 367 acres, mostly contained within existing airport property as depicted <br />on Exhibit A. A small portion of the contour extends northwest of Runway 12. <br /> <br />A-4 <br />