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30C <br /> at Midway. He said propeller aircraft were considerably less noisy. He <br /> said while he had not seen the final "noise exposure calculations" for <br /> Midway he doesn't think there will be a problem. unless a house is very nearby. <br /> Ms. Crawford: "How do you define 'problem'?" <br /> Mr. Matthews: Said that it was a problem if the individual was uncom- <br /> fortable enough to go to a lawyer to do something about it. <br /> Commissioner Willhoit: Asked haw many decibels that would be. <br /> Mr. Matthews: Replied that he didn't know. <br /> Mr. Kizer: "How about the NEF rating?" <br /> Mr. Matthews: "A very clear-cut NEF rating is a 40 NEF; the borderline <br /> is between the 30 and the 40." He said that the airport should control all <br /> "property inside the 40 NEF contours." He added that "there should be some <br /> type of zoning ordinance for properties between the 30 and the 40 NEF to restrict <br /> noise in compatible development." He said that a case by case study should be <br /> made between the 20 and 30 NEF but there shouldn't be a noise problem within those <br /> contours. <br /> Mr. Kizer: Said that he understood that Mr. Matthews would not recommend <br /> agricultural zoning under an airport so would he recommend ind.:strial or what. <br /> Mr. Matthews: "Agricultural use is a compatible use." He said the Raleigh <br /> Durham Airport District grew out of some conferences held with the FAA in the <br /> 60's and it looks like a football oval that extends about three miles off the <br /> end of each runway. He said it conforms almost perfectly to the later developed <br /> 30 NEF contours. He added that the District says there should not be "noise <br /> sensitive development" or places of "public assembly;" this excludes residences. <br /> With regard to general aviation airports, according to the "book we're not <br /> supposed to have a problem." <br /> Mr. Kizer: Asked if in Mr. Matthews' opinion, airports stimulated commer- <br /> cial development. <br /> Mr. Matthews: Replied that some do and some don't. He feels that an air- <br /> port is a "prerequisite for economic growth" but that several factors enter into <br /> an industry's decision to locate a plant in a particular area. He continued, <br /> responding to Ms. Crawford, that jet traffic was not necessarily allowed at those <br /> airports which stimulated growth. He said that with the increased cost of jet <br /> fuel and increased efficiency of propeller planes that the latter planes were <br /> becoming more competitive, particularly over the shorter trips (300-400 miles). <br />