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The outer surface, shown on the Pickering Airport Site Zoning Plan No. 18-001 02-041, Sheets 10, 11, 15, 16, 17, 21, 22, and 23, dated October 30, 2002, is an imaginary surface established at a constant elevation of 45 m above the assigned elevation of the airport reference point, except that, where that surface is less than 9 m above the surface of the ground, the outer surface is located at 9 m above the surface of the ground.
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