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r The proposed construction would be located approximately 1.97 nautical miles north of Dane Co. Regional Airport, Madison, WI. The proposal exceeds the obstruction standards of Federal Aviation Regulations, Part 77, as follows: Section 77.23(a)(5) by 58' - a height exceeding a horizontal surface as applied to Dane Co. Regional Airport. The proposal was circularized for public comment by letter dated January 29, 1993. Two letters of objection were received as a result of circularization. The manager of Dane County Regional Airport stressed the importance of the water tank not interfering with the operation of a proposed Instrument Landing System to be installed on future runway 21. The Wisconsin Department of Transportation (WIDOT) objected to the proposal on the basis that it would adversely impact approach and departure aircraft utilizing runway 4/22. However, no specific impacts were stated. WIDOT also objected on the basis that the water tank exceeds a local height limitation zoning ordinance. This would be a matter to be settled between the proponent and the pertinent governmental authority. Aeronautical study disclosed the proposal would have no effect on any existing or planned instrument flight rules (IFR) operations, procedures, minimum flight altitudes, or air navigation and communication facilities. Study for visual flight rules (VFR) effect disclosed that the proposal would underlie traffic pattern airspace for Category "C" and "D" aircraft. However, the structure does not penetrate a plane 300 feet beneath the airport traffic pattern altitude and would have no impact on these aircraft operations. At 120 feet above ground level, the structure would not penetrate altitudes considered available for VFR enroute operations. The cumulative impact resulting from the proposed construction, when combined with the impact of other existing or proposed structures, was negligible. Therefore, it is determined the proposed structure would have no substantial adverse effect on the safe and efficient utilization of the navigable airspace by aircraft or on the operation of air navigation facilities and would not be a hazard to air navigation. This decision is based solely on the foregoing description of the structure, which includes location & height. The FAA hereby requests that proper notice be given for any future construction or alteration that would exceed the above described heights, or the addition of any transmitting devices. Page 2 of 3 Pages Aeronautical Study 93-AGL-1052-OE