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` - <br /> . <br /> Recommendations, Considerations on the Proposed Midway Airport Clear Zones <br /> The purpose of this presentation is to raise several points <br /> that I believe the Commissioners should consider in ruling on <br /> the request for change of the proposed Midway Airport clear <br /> zone from 5000 feet down to 1000 feet. <br /> The attached diagram illustrate= a 20: 1 clear zone slope which <br /> the FAA considers reasonable for safe airport operation per <br /> DOT (FAA) Advisory Circular 150/5300-4B dated June 24, 1975. <br /> Based on the 20: 1 clear zone slope and the 1000 foot clear <br /> zone requested by the developer , any object, such as a tree at <br /> the end of the runway clear zone must be no higher than 50 <br /> feet , if a clear approach is to be maintained. <br /> Based on a review of tree heights for typical trees in the <br /> area, (Ref; "Knowing your Trees" published by the American <br /> Forestry Assbciation in 1974) , an attained height of 110' is a <br /> reasonable estimate for trees in this area. <br /> Tree Heights for commonly found trees in this area: <br /> Loblolly Pine 120' <br /> Pitch Pine BO - 100' <br /> Long Leaf Pine 100 - 130' <br /> Eastern Red Cedar 120 ' <br /> Lombardy Poplar 100 ' <br /> Hickory 120 - 140' <br /> Beech 120' <br /> Southern Red Oak 100 ' <br /> White Oak 150' <br />