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-12— <br /> Aerial Plan - lsosonic Contour Plan . ,- , <br /> The second overlay shows the isosonic contour limitations for . <br /> the NEF 30 level as delineated by the North Carolina Department of ' -,r 2 <br /> Transportation developed by the methodology used in the North : :4 <br /> Carolina Airport System Flan. . <br /> The wedge shown here is the limitation of the area under the NEF . <br /> is the Noise Exposure Forecast. CNR is the Composite Noise Rating. we: <br /> The state prefers the NEF ratings because it is a measurement of <br /> noise over a time period. According to the State of North Carolina . <br /> evaluations .a_hy land use function is "normally acceptable" under this <br /> rating, and certain functions <br /> ji- <br /> functions within this wedge under the state guidelines include re- 1:,..,, <br /> trz <br /> skiential areas, schools, libraries, churches, hospitals, nursing <br /> homes, playgrounds and parks, office buildings, commercial buildings, ‘1,,,' <br /> manufacturing uses, public right-of-ways, extensive natural recreation -,' <br /> oi <br /> areas, and most importantly agricultural and livestock . <br /> farming including animal breeding. This NEF 30 wedge is limited <br /> area as shown. Any area outside this wedge is affected even less t <br /> by any noise. 6- <br /> Further backup is provided by a study done hy the Calibration ,. <br /> and Auditory Research-Laboratory, Hearing and Speech Center, School 1 4..',-,i <br /> of Medicine, Chapel Hill, North Carolina. This study done for Horace i ''';:.': <br /> Williams Airport documents noise levels from overflying aircraft of the -,,; <br /> size and type presently housed there and proposed to be allowed at 0 <br /> IL gs: <br /> Midway Airport. The results of that study are aptly summarized in r.z.,)- <br />