70 ILCS 2405/22a.42
Except as otherwise provided in Section 9-2-113 of the Illinois Municipal Code, as now or hereafter amended, notice shall be given by the committee of local improvements that bids will be received for the construction of such an improvement, either as a whole or in such sections as the committee shall specify in its notice, in accordance with the ordinance therefor. This notice shall state the time of opening of the bids, and shall further state where the specifications for the improvement are to be found, and whether the contracts are to be paid in cash, vouchers or bonds, and if in vouchers or bonds, then the rate of interest the vouchers or bonds shall draw. The notice shall be published at least twice, not more than 30 nor less than 15 days in advance of the opening of the bids, in one or more newspapers designated by the committee with a general circulation within the district.
Proposals or bids may be made either for the work as a whole or for specified sections thereof if permitted by the specifications which are part of the ordinance. All proposals or bids offered shall be accompanied by a bid bond satisfactory to the committee. These proposals or bids shall be delivered to the committee, and at the time and place fixed in the specified notice the committee's engineer or his delegate shall examine and publicly declare the proposals or bids.
70 ILCS 2405/22a.42