§ 10-7.203. Airport Zone Surfaces and Height Limitations.

In order to carry out the provisions of this Article, there are hereby created and established certain surfaces, which include the approach surfaces, transitional surfaces, horizontal surfaces, and conical surfaces as they apply to the airport. Such surfaces are shown on the adopted Modesto City-County Airport Layout Plan (ALP), on file at the City of Modesto Airport offices. Said ALP, and all notations, references, and other information shown therein, is hereby made a part of this Article. Except as otherwise provided in this Article, no structure or tree shall be erected, altered, allowed to grow, or be maintained in the Airport Zone created by this Article to a height in excess of the surfaces herein established. An area located beneath more than one of the following surfaces is subject only to the more restrictive height limitation.

(a)

Utility runway visual approach surfaces. The utility runway visual approach surfaces are located at each end of the primary surface of the south runway. Each surface width is two hundred fifty (250) feet wide where it adjoins the primary surface. These approach surfaces expand outward uniformly from each end of the primary surface to a width of one thousand two hundred fifty (1,250) feet at a horizontal distance of five thousand (5,000) feet, the center line being the continuation of the center line of Runway 10R/28L. These approach surfaces slope upward one-foot vertically for each twenty (20) feet horizontally, beginning at each end of and at the same elevation as the primary surfaces.

(b)

Nonprecision instrument approach surface. The nonprecision instrument approach surface is located at the west end of the primary surface of the north runway. This approach surface width is one thousand (1,000) feet wide where it adjoins the primary surface. This approach surface expands outward uniformly from the west end of the primary surface to a width of three thousand five hundred (3,500) feet at a horizontal distance of ten thousand (10,000) feet, its centerline being the continuation of the center line of Runway 10L. This approach surface slopes upward one-foot vertically for each thirty-four (34) feet horizontally beginning at the end of and at the same elevation as the primary surface.

(c)

Precision instrument approach surface. Precision instrument runway approach surface is located at the east end of the primary surface of the north runway. This approach surface width is one thousand (1,000) feet wide where it adjoins the primary surface. This approach surface expands outward uniformly from the east end of the primary surface to a width of sixteen thousand (16,000) feet at a horizontal distance of fifty thousand (50,000) feet, its center line being the continuation of the center line of Runway 28R. This approach surface slopes upward one-foot vertically for each fifty (50) feet horizontally beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of ten thousand (10,000) feet along the extended runway center line; it then slopes ten thousand (10,000) feet along the extended runway center line; it then slopes upward one-foot vertically for each forty (40) feet horizontally to an additional horizontal distance of forty thousand (40,000) feet along the extended runway center line.

(d)

Transitional surfaces. The transitional surfaces extend outward from the primary surfaces and the approach surfaces at a 90-degree angle to the runway center lines to where the transitional surfaces intersect the horizontal surface. The transitional surfaces adjacent to that portion of the precision instrument approach surface beyond the limit of the conical surface, extend a distance of five thousand (5,000) feet measured from the edge of said approach surface at a 90-degree angle to the extended runway centerline. The transitional surfaces slope upward one-foot vertically for each seven (7) feet horizontally beginning at the sides of and at the same elevation as the primary surfaces and the approach surfaces.

(e)

Horizontal surface. The periphery of the horizontal surface is located by swinging arcs of ten thousand (10,000) feet radii from the center of each end of the primary surface of Runway 10L/28R and connecting the adjacent arcs by drawing lines tangent thereto and parallel to the runway center line. The inner edge of the horizontal surface is defined by its intersection with the transitional surfaces. The horizontal surface is one hundred fifty (150) feet above the airport elevation.

(f)

Conical surface. The conical surface commences at the periphery of the horizontal surface and extends outward therefrom a horizontal distance of four thousand (4,000) feet. The conical surface slopes upward one-foot vertically for each twenty (20) feet horizontally beginning at the periphery of the horizontal surface.

(g)

Exception to height limitations. Nothing in this Article shall be construed as prohibiting the growth, construction, or maintenance of any tree or structure to a height up to thirty-five (35) feet above the land beneath any surface in the Airport Zone. This exception does not apply to any land over which the City of Modesto owns an avigation easement.