Morrisville Unified Development Ordinance - June 2023.1

liquids, gases, chemicals, or other hazardous substances shall be located underground to reduce the hazardous consequences from an airplane crash. Structure Height The height of any structure in the Airport Overlay-A District or Airport Overlay-B District shall not exceed that which constitutes an obstruction to air navigation, navigational aids, or navigational facilities under standards of the Federal Aviation Administration (FAA) in 14 CFR Part 77, Subpart C, as applied to the area around Raleigh-Durham International Airport, unless the FAA determines no substantial obstruction exists in accordance with 14 CFR Part 77, Subpart D. Documentation of compliance with this requirement may be required for any structure or structural alteration that extends more than 50 feet above ground level. Outdoor Lighting a. Outdoor lighting in the Airport Overlay-A District or Airport Overlay-B District shall be shielded to minimize direct skyward glare from the light source and otherwise located and designed to avoid producing light emissions — whether direct or indirect (reflective) of such intensity and directed in such directions as to impair pilot visibility or otherwise interfere with the safe operation of overhead aircraft. b. Lighting of towers, tall buildings, and other potential obstructions to air navigation shall include warning lighting that complies with FAA standards in Advisory Circular 70/7460-1 (Obstruction Marking and Lighting). Electronic Interference No use, development, or activity in the Airport Overlay-A District or Airport Overlay-B District shall produce electronic emissions that interfere with navigation signals or radio communications between aircraft and landing control facilities or with aircraft navigational or communication equipment.

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Sound Mitigation

a. Airport Overlay-A New construction, or substantial improvement, of buildings within the Airport Overlay-A District shall be designed to limit interior noise from aircraft to an average day/night sound level (DNL) of 45 dB in the following use categories if permitted in Table 4.2.4, Principal Use Table:

(1) Group Living Uses (e.g. dormitories);

(2) Community and Government Service Uses (e.g. clubs or lodges, college or universities, public park or recreation facilities, business or vocational schools, or sports academies); and

(3) Health Care Uses (e.g. hospitals, nursing homes).

b. Airport Overlay-B New construction, or substantial improvement, of buildings within the Airport Overlay-B District shall be designed to limit interior noise from aircraft to an average day/night sound level (DNL) of 45 dB in the following use categories if permitted in Table 4.2.4, Principal Use Table: (1) Household Living Uses (e.g. dwellings, including Multi-family dwellings, or family care homes);

(2) Group Living Uses (e.g. congregate living facilities, dormitories, or rooming houses);

(3) Community and Government Service Uses (e.g. clubs or lodges, elementary, middle and high schools, cultural facilities, day care centers, places of worship, or sports academies);

(4) Health Care Uses (e.g. hospitals, nursing homes); and

(5) Visitor Accommodation Uses (e.g. bed and breakfasts or hotel/motels).

Morrisville, NC

October 1, 2021

Unified Development Ordinance

Page 3-57