(a) a surface abutting each end of the strips associated with the runways designated 06L-24R, 06R-24L, 06LC-24RC, 06RC-24LC, 11L-29R and 11R-29L, consisting of an inclined plane having a ratio of one (1) foot measured vertically to sixty (60) feet measured horizontally rising to an imaginary horizontal line drawn at right angles to the projected centre line of each strip at one hundred and sixty-six and sixty-six hundredths (166.66) feet measured vertically above the elevation at the end of each strip, and ten thousand (10,000) feet measured horizontally from the end of the strip, the outer ends of each imaginary horizontal line being two thousand (2,000) feet from each projected centre line, and
