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MAR 18 1993 BOOK 89 F,.GE 69 ORDINANCE 93-2. AIRPORT HEIGHT LIMITATION ZONE - Subzone A. The area surrounding each Licensed Public Use Airport extending outward 20,000 feet from the ends and each side of all active runways, and Subzone B. That area within the unincorporated area of the county not within Airport Height Notification Subzone A. AIRPORT NOISE IMPACT ZONE - An area contiguous to a publicly licensed airport measuring one-half (1/2) the length of the longest active runway on either side of and at the end of each active runway centerline. For land use control purposes, this boundary shall be considered to be consistent with the 65 to 70 ldn zone determined by an official Part 150 Noise Study. AIRPORT OBSTRUCTION (Hazard) - Any structure or object of natural growth or use of land which would exceed the federal obstruction standards as contained in 14 CFR Parts 71.21, 77.23, 77.25, 77.28, and 77.29 and which obstructs the airspace required for flight of aircraft in taking off, maneuvering or landing at an airport or is otherwise hazardous to taking -off, maneuvering or landing of aircraft, and is unpermitted, or for which a variance has not been granted. AIRPORT RUNWAY CLEAR ZONE - An area at ground level which begins at the end of a primary surface (as defined in 14 CFR Part 77) and extends with the width of each approach surface (as defined in 14 CFR part 77) to terminate directly below each approach surface slope at the point, or points, where the slope reaches a height of 50 feet above the elevation of the runway or 50 feet above the terrain at the outer extremity of the clear zone, whichever distance is shorter. EASEMENT, AVIGATION - A right of use over property whereby an airport proprietor may operate over real property of another. ELEVATION, AIRPORT - The highest point of the airport's usable landing area measured in feet Above Mean Sea Level (AMSL). LANDING AREA - The area of the airport used for the landing, take -off, or taxiing of aircraft. Ldn - a day/night 24-hour average sound level, in decibels, obtained after addition of 10 decibels to sound levels occurring during the night time period from 10 PM to 7 AM. NOISE LEVEL REDUCTION (NLR) - (also known as Sound Level Reduction (SLR)) Reduction in sound level decibels between two designated locations or rooms for a stated frequency or band. ROOMS, OCCUPIED - Rooms within enclosed structures which are or may reasonably be expected to be used for human activities which involve speech communication; sleeping; eating; listening to live, recorded or broadcast music or speech; or the regular use of telephones. RUNWAY - A defined area on an airport prepared for landing and takeoff of aircraft along its length. Coding: Words in blocked -out type are deletions from existing law. Words underlined are additions. 11 18