To carry out the purpose of this district, the Airport Overlay (AO) District is composed of four overlapping subarea districts that establish different levels of restrictions based on airport boundary areas of influence, safety areas based on hazard zones and structure height regulations, and noise contours as follows. Properties or portions of properties located within multiple subareas shall comply with the standards established for each of those subareas in which the property is located.
(B) AO-2 Safety Zones Area. The Safety Zones Area designates the subarea that primarily includes standards for land use, density, and design as designated in §§ 151.088 through 151.090. The boundary of this area is determined by FAA and DoD imaginary surfaces definitions for military and civilian airfields (clear zone, runway protection zone, accident potential zone 1 and accident potential zone 2) in effect on the effective date of these airport overlay regulations in conjunction with any other relevant safety area data obtained by the Director.
(C) AO-3 Height Restriction Area. The Height Restriction Area designates the subarea that primarily includes standards for controlling height as described in §§ 151.091 through 151.094. The boundary of this area is determined by a combination of measurements including a 1,500 foot buffer around Scott Air Force Base and imaginary surfaces definitions for military and civilian airfields in effect on the effective date of these airport overlay regulations, in conjunction with any other relevant height restriction data obtained by the Director.
(D) AO-4 Noise Zones Area. The Noise Zones Area designates the subarea that primarily includes standards for the attenuation of noise and residential land use controls as specified in §§ 151.095 through 151.098. This boundary is determined by applying the noise contours published by the DoD for Scott Air Force Base in conjunction with any other relevant noise data obtained by the Director.