Lake County Zoning Code § 39.4 Definitions (CA)

(a) County airport: Lampson or Pearce Airport
(b) Airport elevation: Lampson - 1,368 feet above mean sea level. Pearce - 1,385 feet above mean sea level.
(c) Approach surface: A surface longitudinally centered on the extended runway centerline, extending outward and upward from the end of the primary surface and at the same slope as the approach zone height limitation slope set forth in Section 39.6 of this Article. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone.
(d) Conical surface: A surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty (20) to one (1) for a horizontal distance of three thousand (3,000) feet.
(e) Hazard to air navigation: An obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace.
(f) Height: For the purpose of determining the height limits in all airport zones set forth in this Article and shown on the sectional district zoning map, the datum shall be mean sea level elevation unless otherwise specified.

39-1

(g) Horizontal surface: A horizontal plane one hundred fifty (150) feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.
(h) Non-conforming use: Any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provisions of this Article or an amendment thereto.
(i) Obstruction: Any structure, growth, or other object, including a mobile object, which exceeds a limiting height set forth in Section 39.6 of this Article.
(j) Primary surface: A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond each end of that runway. When the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at each end of that runway. The width of the primary surface is set forth in Section 39.5(a) of this Article. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.
(k) Runway: A defined area on an airport prepared for landing and take-off of aircraft along its length.
(l) Structure: An object, including a mobile object, constructed or installed by man, including but without limitation, buildings, towers, cranes, smokestacks, earth formation, and overhead transmission lines.
(m) Transitional surfaces: These surfaces extend outward at ninety (90) degree angles to the runway centerline and the runway centerline extended at a slope of seven (7) feet horizontally for each foot vertically from the sides of the primary approach surfaces to where they intersect the horizontal and conical surfaces.
(n) Tree: Any object of natural growth.
(o) Utility runway: A runway that is constructed for and intended to be used by propeller driven aircraft of twelve thousand five hundred (12,500) pounds maximum gross weight and less.
(p) Visual runway: A runway intended solely for the operation of aircraft using visual approach procedures.