The preliminary plat shall be clearly and legibly drawn. The size of the drawing shall not be less than 24” x 36”. If the preliminary plat is to be drawn in sections, each section shall be accompanied by a key map, showing the location of the sections. The plat of a subdivision containing 5 acres or less shall be drawn to a scale of 1” = 50’. All other subdivisions shall be drawn to a scale of 1” = 100’.