The City may contract for the construction of any sidewalk and the City Engineer is hereby authorized in his official capacity to make all written contracts and receive all bids. Such contracts shall specify a reasonable time for the completion of the improvement and all work must be done under the direction of the Street Transportation Director subject to such rules and regulations relating to the supervision of the work as the City Council may order and direct. (Code 1962, § 35-74; Ord. No. G-3313, § 1)