55 ILCS 5/5-32042
If the contractors, who may have taken any contract, do not complete the work within the time mentioned in the contract, or within such further time as the Committee may give them, the Committee may relet the unfinished portions of that work, after pursuing the formalities prescribed hereinbefore for the letting of the whole in the first instance.
All contractors at the time of executing any contract for such public work, shall execute a bond to the satisfaction and approval of the Committee of the county in such a sum as the Committee deems adequate, conditioned for the faithful performance of the contract. The sureties shall justify, before some person competent to administer an oath, in double the amount mentioned in that bond, over and above all statutory exemptions.
55 ILCS 5/5-32042