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The outer surface, shown on Public Works Canada Stephenville Airport Zoning Plans S-1670-0, S-1670-1, S-1670-2, S-1670-3, S-1670-4, S-1670-5, S-1670-6, S-1670-7 and S-1670-8, dated July 31, 1985, 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 that, where that common plane is less than 9 m above the surface of the ground, the imaginary surface is located at 9 m above the surface of the ground.
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