The purpose of the Airport Overlay is to minimize land use incompatibilities for McChord Air Force Base and Pierce County Airport/Thun Field. Provisions of this Section address reduction of incompatibilities with these airports through performance standards, building coverages, limitations on the number of persons on site at any one time, limitations on allowed uses and/or construction of buildings with noise attenuation features, depending upon the situation. Uses permitted and reviews required for activities within the Airport Overlay vary depending on the designation given to the particular airport.