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-291 <br /> interest on the part of the County to provide an airport to sheet the demand <br /> that exists in the County for the service. Mr. Matthews cited the North <br /> Carolina Airport System Study as the basis for.the demand for regional air- <br /> port services in Orange County. Consequently, private development of this <br /> airport was encouraged given the above reasons. <br /> Mr. Irvin: Directed questions regarding the clear and approach zones to <br /> Mr. Matthews saying, that as he understood Matthews' letter of June 29, 1982, <br /> Buck Mountain Developers wbuld be required to control a distance of 1000' clear <br /> zone from the end of the runway plus 200' approach zone; making a distance of <br /> 1200' from the end of the runway to be controlled by Buck Mountain Development <br /> Corporation. Mr. Irvin cited the figure of 20:1 for rise in the approach zone <br /> (including the 1000' clear zone), saying the rise for the 1200' would be 60'. <br /> Mr. Matthews: Said that was not correct that the rise would be 50'. He <br /> elaborated saying: <br /> We would begin at runway elevation and go out 200' at runway elevation <br /> so we have a rise of 0' / zero.feet3 for that first 200. The clear zone <br /> is defined by FAA as the first 1000' of the approach surface or the point <br /> at which the approach surface is 50' above ground level. Assuming that we <br /> have a completely flat terrain, that would mean per at the 1000' mark. From <br /> the beginning of the approach surface to the 1000' mark, the approach sur- <br /> face would rise 50'; so that the point 1200' from the runway the approach <br /> surface would be 50' above runway elevation. <br /> Mr. Irvin: Cited the heights of two different trees (loblolly pine and <br /> tulip ) noting that each grows to a reasonable average height of 100'. He suggested <br /> that someone who owns land in the approach might have trees of that size which <br /> would penetrate the approach zone. <br /> Mr. Matthews: Agreed but added that "The approach surface is a relative <br /> height; the absolute height of the tree...is of very little importance at this <br /> point. Rather the relative height of the tree..ah..for example, if one went <br /> out this 1000' if the ground at that point were 50' lower than the runway, we <br /> could have a 100' tall tree a 1000' from the end of the runway and it would not <br /> penetrate through the approach surface." <br /> Mr. Irvin: Replied that then the converse must also be true, i.e., if the <br /> ground slopes upward the tree height would have to be added. <br /> Mr. Matthews: Replied that each site must be considered independently; that <br /> they would actually go out and measure the heights of the trees in the approach <br /> areas. <br /> Planning Board Chair Pat Crawford: Asked if NCDOT would then modify its <br /> requirements. <br />