One-half inch expansion joints shall be spaced 25 to 30 foot intervals or as otherwise specified and shall be placed where new work abuts old work, or where new work is constructed adjacent to either concrete work, walls, foundations, etc. The expansion joints shall be filled with premoulded bituminous expansion joint filler or other approved type and shall extend the entire depth and width of the concrete section. Sidewalk markings shall be grooved three-eights inch deep on four to five foot centers. (Ord. 8590)