Before any new improvements are made which are to be paid for out of the general funds of the city, the mayor shall cause plans and specifications to be prepared and an estimate of the costs made. If the estimated cost does not exceed eight thousand dollars ($8,000.00), the improvements may be made without publication of notice and advertising for bids, but if the estimated cost exceeds eight thousand dollars ($8,000.00), a contract must be let after publication of notice for at least five (5) days in a newspaper of general circulation published in the city; or personal notice to interested bidders as the mayor may order. The mayor shall have the right to reject any or all bids received and all notices calling for bids shall so state. In case bids are called as provided in this section and the proposals received shall exceed the estimate of the cost of making the improvements, all bids shall be rejected and the mayor shall advertise anew in the same manner as before. If, after twice advertising as provided in this chapter, no bid shall be received which is satisfactory and less than the estimated costs of such improvements, the mayor may proceed under his or her own direction to make the improvement. Nothing in this section shall be construed to require bids to be called for, or contracts let, for the conduct or management of any of the departments, business or property of the city or for lowering or repairing water mains or sewers or making connections with water mains or sewers or for the grading, repairing or maintenance of streets, sidewalks, bridges, culverts or conduits. (1989 Code: prior code § 13-1-2)