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The outer surface, shown on Halifax International Airport Zoning Plan Nos. S-2449-13 to S-2449-15 inclusive, S-2449-23 to S-2449-25 inclusive and S-2449-29 to S-2449-31 inclusive, dated March 30, 1990, is an imaginary plane established at a constant elevation of 45 m above the elevation of the airport reference point, 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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