No person shall build, construct, reconstruct or alter any sidewalk, curb and gutter, or any combination thereof, in or at any intersection within the corporate limits of the city unless the same include and conform to the wheelchair ramp specifications attached to ordinance 586 as exhibit A on file in the office of the city finance officer and incorporated herein by this reference with the same full force and effect as if set forth at length herein. (1975 Code § 12.04.120)