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The outer surface, shown on Muskoka Airport Zoning Plan No. 44-002-82-48, Sheets 1 to 11 inclusive, dated August 24, 1983, is an imaginary surface located at a common plane established at a constant elevation of 45 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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