Sidewalks shall be a minimum width of four feet and shall be four inches thick unless wider dimensions are required in the Street Design Manual of the city of Dallas. The surface may have a monolithic finish by floating with a wooden float until a slight excess of sand appears on the surfaces or may be brushed after troweling in lieu of floating. The edges of the sidewalk, markings and expansion joints shall be tooled to a smooth finish, not less than two inches in width. Exposed edges of the sidewalk shall be rounded with an edger to a radius of one-half inch. The surface of the sidewalk shall not be left with a slick or glossy finish. (Ord. 8590; 31313)