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The outer surface, shown on Toronto Island Airport Zoning Plan No. 20-004-83-113, Sheets 2, 3, 4, 6, 7 and 8, dated October 26, 1984, is an imaginary surface located at a common plane established at a constant elevation of 76 m above the assigned elevation of the airport reference point except where that common plane is less than 9 m above the surface of the ground, the outer surface is an imaginary surface located at 9 m above the surface of the ground.
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