Nothing in this article shall affect the bond of any person, firm or corporation now engaged in constructing, reconstructing or repairing such facilities which have already been executed in accordance with the terms of existing city laws, nor shall this be construed to in any manner diminish the liability of any surety or principal on such bond. No person having a bond to construct, reconstruct, alter, repair, remove or replace sidewalks, curbs, gutters or driveways on public property within the city shall be permitted to take out a permit for the reconstruction, alteration or repair of any such facility on any public property within the city and allow any person other than the bona fide holder of such bond to do any of the work. No permit for the construction, alteration or repair of any sidewalk, curb, gutter or driveway on any public property within the city shall be granted unless the five year maintenance bond provided for herein shall be in full force and effect at the time of request for such permit and the doing of the work. (Ord. 8590)