70 ILCS 605/10-2
When a petition, signed by not less than two-thirds of the adult landowners in any area which will be benefited by a particular portion of any work theretofore ordered constructed and who own not less than two-thirds of the lands in such area, is filed with the court before the commissioners of the district enter into a contract for the construction of such work and before any lien has attached to the assessment levied to pay the cost thereof, the court shall order the commissioners to abandon such work and to rebate the assessments paid and abate the unpaid assessments attributable to such work. Upon the filing of the petition it shall be presented to the court, set for hearing, and heard after notice in the manner provided in Sections 4--19 to 4--24, inclusive. If notice is given by publication then the clerk shall, within 4 days after the first publication, mail a copy thereof to each of the commissioners. The order directing such abandonment, rebate and abatement shall be conditioned upon the petitioners reimbursing the district within 30 days for the proportionate share of the costs and expenses attributable to the abandoned work and assessment, including the fees of the commissioners, treasurer, clerk, engineers and attorneys, theretofore incurred by the district, and including all costs and expenses to be incurred by the district in connection with the rebate and abatement of a portion of the assessment, which costs and expenses shall be fixed and determined by the court in its abandonment order. If the petitioners fail to reimburse the district as provided in the order within such 30 day period, the order shall be vacated and shall thereafter be without force or effect. Any assessment levied to pay the cost of the portion of the work subsequently abandoned shall be rebated and abated as hereinbefore provided in Section 5--30.
70 ILCS 605/10-2