Screening from adjacent residential properties. Developers of special use property adjacent to existing residentially developed property shall provide a screen along the rear property line and along the side property lines up to the point of intersection with the front yard setback line. Required screening shall take the form of a continuous hedge which, when mature, is at least six feet high with a wood or metal fence at least six feet high, at least 50% of the area of which shall be solid or opaque materials, or a line of evergreen trees at least three feet high when planted, that will grow together when mature, with a wood or metal fence at least six feet high, at least 50% of the area of which shall be solid or opaque materials.