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The Plan provides additional general, noise, safety, aircraft protection, and overflight regulations and supporting criteria that apply to each of the compatibility zones.Section 4.5 Compatibility Zone C Compatibility Zone C encompasses locations exposed to potential noise in excess of approximately 60 dB Community Noise Equivalent Level (CNEL) together with additional areas occasionally affected by concentrated numbers of low-altitude aircraft overflights. To the greatest extent practical, the boundaries are delineated so as to follow sections, lines, other geographic features, and fixed offset distances from the extended runway centerlines. 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