1 Being a surface abutting each end of strips designated as 17-35 and 11-29, consisting of an inclined plane having a ratio of one (1) foot measured vertically to fifty (50) feet measured horizontally, rising to an imaginary horizontal line drawn at right angles to the projected centre line of each strip, one thousand (1,000) feet above the elevation at the end of each strip, measured vertically and fifty thousand (50,000) feet from the end of each strip, measured horizontally, the outer ends of each imaginary horizontal line being eight thousand (8,000) feet from each projected centre line, which surface is shown on Department of Transport Plan No. MT-0451 (A, B, C, D, E, F, G) dated January 6, 1970.