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The outer surface, shown on Mayo Airport Zoning Plan No. E.3028, dated March 28, 1994, is an imaginary plane established at a constant elevation of 45 m above the elevation of the airport reference point extending to the outer boundary described in Part VI, except that, where that plane 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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