(a) At any time after the passage of the original resolution provided for in Section 19-104 by the city council, and more particularly at any time after a hearing is given as provided in Section 19-107 to the property owners and lienholders owning property in the drainage district created, the director of water utilities may submit specifications for the doing of work contemplated in such improvement, which specifications must in general terms set forth the nature and extent of the improvement or improvements to be made, the section or section to be improved, and the material or materials with which the improvements are to be constructed. Such specifications may provide, at the election of the city council, that such improvements may be constructed from different materials and may specify different or alternative methods of making such improvements. The director of water utilities shall make approximate estimates of the cost of improvements under the different methods desired to be employed.
(b) Upon the adoption of specifications, if the city council decides to do the work by contract, the city secretary, or such other officer as may be designated by the city council, shall advertise for sealed bids for the construction of such improvements in accordance with the specifications. The advertisement must be inserted in a daily paper of general circulation in the city and state the time within which bids may be received as prescribed by the city council, which time may not be less than 10 or more than 15 days from the insertion of the advertisement. Bids must be filed with the city secretary, or such other officer as the board may designate, and must be opened and read in a public meeting of the city council. The city council shall have the right to accept such bids as it deems most advantageous to the city and the owners of the property abutting upon the public highway named to be improved, or may reject any and all bids. Where an improvement is ordered upon different specifications, or for the construction of work or any part of the work with different materials or under different plans or methods of construction or payment for such improvement, the city council may, after opening bids, select such methods, plans, or materials for making such improvement, or any part of the improvement, as it deems best, and to let the work to such bidder and upon such bid as it may select. No bid may be amended, changed, or revised after being filed.
(c) When bids for improvements have been accepted by the city council, the city shall enter into contract with the contractor to whom the work has been let for the performance of the improvements, which contracts must be executed in the name of the city or by its city manager and must be attested by the city secretary, or such other officer as may be designated by the city council, with the corporate seal. The contractor to whom the work has been let shall execute a bond as may be required by the city council and as provided by the charter. The contract and bond, if satisfactory, must be approved by the city council. (Code 1941, Art. 128-13; Ord. Nos. 22026; 28424; 30994)