All signatures, except those of the City Clerk, City Attorney, Clerk of the Board of Supervisors and the county recorder shall be affixed to the title sheet prior to the City Engineer’s signature on the final map. The abstract of title or chain of title may be required by the City Engineer prior to approval of the final map. The bond and agreement provided for in this section shall be filed with the City Engineer prior to approval of the final map. (Ord. 3153 § 2 (Exh. C), 2010).