§ 58.372. Establishment of Aircraft Noise/Land Use Control Zones.

Aircraft Noise/Land Use Control Zones - Five separate Aircraft Noise/Land Use Control Zones shall be established as shown on the Aircraft Noise/Land Use Control Zone Map (Figure 7A). The Aircraft Noise/Land Use Control Zones are based on a projection of future noise environments arising from aircraft flight operations at the OIA and OEA, as such environments were defined by FAR Part 150 Studies.

A composite contour was developed to establish the aircraft noise overlay zones. This was accomplished based on land use controls for two noise metrics (DNL and dBA Aircraft Noise Metric). The DNL metric is a day-night sound level used to present cumulative/average long term aircraft noise exposure. The dBA Aircraft Noise Metric is a single event maximum sound level measure used to describe peak noise levels of representative aircraft flyovers as related to speech interference.

Zone A - 75 and greater DNL contour

Zone B - 70 to 75 DNL contour

Zone C - 65 to 70 DNL contour

Zone D - The composite limits of the 60 DNL contour and the 80 dBA Aircraft Noise Metric contour to the 65 DNL contour.

Zone E - The composite of the limits of the 55 DNL and the 75 dBA Aircraft Noise Metric contour to the composite limits of the 60 DNL contour and the 80 dBA Aircraft Noise Metric contour.

The boundaries of the AN Overlay district shall be construed as the outer boundary of Zone E, and may be altered by initiation of the City Council or Municipal Planning Board whenever there is a finding that noise impacts have changed, via a FAA Part 150 Study.

Determination of Boundaries. In determining the location of noise zone boundaries on the Aircraft Noise/Land Use Control Zone Map, the following standards shall apply:

1.

For platted lots less than one (1) acre in size, where an Aircraft Noise/Land Use Control Zone boundary line enters or crosses said platted parcel, the land use restriction and sound level reduction standards associated with the more stringent Aircraft Noise/Land Use Control Zone shall apply.

2.

For platted and unplatted properties greater than 1 acre in size, where an Aircraft Noise/Land Use Control Zone boundary line enters or crosses the parcel, the regulations associated with more than one zone may apply. The City shall utilize the Aircraft Noise/Land Use Control Zone Map over-layed onto a 1/8 th section line map to determine the applicable Aircraft Noise/Land Use Control Zone. The City, in consultation with the Greater Orlando Aviation Authority, shall determine the applicable line of demarcation. If conflicts arise, the City's determination may be appealed to the Municipal Planning Board and City Council.

(Ord. of 9-16-1991, Doc. #25094; Ord. of 8-23-1999, § 11, Doc. #32283)