Where the City accepts dedication of all or some of the required improvements following completion, the City Engineer shall require the posting of financial security to secure structural integrity of said improvements in accordance with the design and specifications as depicted on the Final Plat for a term not to exceed five (5) years from the date of acceptance of dedication. Said financial security shall be the same type as otherwise required in this Chapter with regard to the installation of said improvements, and the amount of the financial security shall not exceed ten (10) percent of the actual cost of installation of said improvements.