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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 />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 />5. TRANSITIONAL ZONE: All that land which lies directly under <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 />B. HEIGHT RESTRICTIONS: Except as otherwise provided in the <br />Ordinance, and except as necessary and incidental to airport <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 />9 <br />