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the periphery of the horizontal surface at a slope of 20 to <br /> 1 for a horizontal distance of 4,000 feet as measured <br /> radially outward from the periphery of the horizontal <br /> surface. <br /> <br /> 4. APPROACH ZONE: All that land which lies directly under an <br /> imaginary approach surface longitudinally centered on the <br /> extended centerline at each end of the runway. The inner <br /> edge of the approach surface is at the same width and eleva- <br /> tions as, and coincides with, the end of the primary <br /> surface. The approach surface inclines upward and outward <br /> at a slope of 40:1 for Runways 16 and 34. The approach <br /> surface expands uniformly to a width of 3,500 feet for <br /> Runways 16 and 34 at a distance of 10,000 feet to the peri- <br /> phery of the conical surface. <br /> <br />5. TRANSITIONAL ZONE: All that land which lies ,directly under <br /> <br /> an imaginary transitional surface extending upward and <br /> outward at right angles to the runway centerline and the <br /> runway centerline extended at a slope of 7:1 from the sides <br /> of the primary surface and from the sides of the approach <br /> surface. <br /> <br />?~iGH? P~STR!CTiOI{S: Except as othe~ise provided in the <br />~:-- ~= and except ac ~e~essary <br />operations, no structure or tree shall be constructed, altered, <br />maintained, or allowed to grow in any airspace created in <br />Subsection iV-A so as to project above any of the imaginary <br />airspace surfaces described in said Subsection iV-A hereof. <br />Where an area is covered by more than one height limitation, the <br />more restrictive limitations shall prevail. <br /> <br /> 9 <br /> <br /> <br />