A complete improvement plan "as built" shall be filed with the city engineer upon completion of said improvements. The "as built" plans to be drawn on copies of the original tracings and certified as to accuracy and completeness by the subdivider’s licensed contractor. Upon receipt and acceptance of the "as built" plan, the city engineer will recommend formal acceptance by the city council. (Ord. 1046 NCS §1 (part), 1972; prior code §22.8.300.)