Fences, Hedges, Walls and Screen Plantings. Fences, hedges, walls and screen plantings shall be erected subject to the provisions of § 36-18.28, and the prohibitions against vision obstructions in § 36-18.23. Whenever an N-O use is proposed to be located adjacent to a Residential District, an eight (8) foot masonry wall shall be constructed along the property line pursuant to § 36-24.