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b. Existing and ultimate approach sl pes and any height or slope protection established y local zoning ordinance. e. A plan and profile of the clear zones and approach areas showing the controlling structures and trees therein (i.e., usually the tallest object within a cluster) and their elevations. Also roads, railroads, and polelines that cross clear zones and approach areas should be shown on the profile (highest eleva- tion) . d. Location and elevation of obstructions exceed- ing criteria in FAR Part 77, (obstructions off the plan may be indicated by a note). If there is a cluster of tall objects within close proximity of each other, only the elevation of the tallest object need be shown. Any plans concerning the alteration or re- moval of obstructions should be noted. e. For airports serving jet aircraft and within the boundaries defined by the imaginary surfaces given in FAR Part 77, an outline of all areas with present or potential concentrations of people should be shown on the drawing. Indicate the primary type of development in these areas such as industrial, resi- dential, ballparks, schools, and hospitals. For other airports this information should be shown for the areas under the approach surfaces and at least 1,000 feet to either side of each runway or 500 feet from the nearest aircraft operational area. In densely populated areas, it is not necessary to pinpoint each 36 hospital, school, etc., in close proximity to one an- other. f. In the approach areas, tall smokestacks, tele- vision, and radio transmission towers, garbage dumps, or other areas attracting a large number of birds, and any other potential hazard to aircraft flight. 57. Airport Layout Plan Report. A current airport layout plan is a requirement of a project ap- plication for an Airport Development Aid Program (ADAP) grant and may be prepared for this purpose in lieu of a complete master plan. In this event, the airport layout plan should be accompanied by a written report which documents the following: a. Reasoning behind design features such as demand/capacity analysis, etc. b. Basis and/or computation for tit, runway length design. c. Basis for runway orientation if not aligned for maximum wind coverage. d. Low visibility wind data where available. (Such data may be used for evaluating contemplated airport development.) 58. Typical Airport Layout Plans. Typical airport layout plans for a large, medium, and small airport are shown on the drawings, Figures 1 through 4. Guidance material which will be useful in the development of airport layout plans is listed in Chapter 4, Facility Requirements.