220 ILCS 50/7
In the event of any damage to or dislocation of any underground utility facilities in connection with any excavation or demolition, emergency or nonemergency, the person responsible for the excavation or demolition operations shall immediately notify the affected utility and the State-Wide One-Call Notice System and cease excavation in the area of the damage when the damaged facility is a threat to life or property or if otherwise required by law or, in the case of damage or dislocation in connection with any excavation or demolition within the boundaries of a municipality having a population of at least 1,000,000 inhabitants that operates its own one-call notice system, notify the affected utility and the one-call notice system that operates in that municipality. The person responsible for the excavation or demolition shall not attempt to repair, clamp, or constrict the damaged utility facility unless under the supervision or advisement of the utility facility owner or operator. At no time shall a person under this Act be required by a utility facility owner or operator to attempt to repair, clamp, or constrict a damaged utility facility. In the event of any damage to any underground utility facility that results in the escape of any flammable, toxic, or corrosive gas or liquid, the person responsible for the excavation or demolition shall call 9-1-1 and notify authorities of the damage. Owners and operators of underground utility facilities that are damaged and the excavator involved shall work in a cooperative and expeditious manner to repair the affected utility.
220 ILCS 50/7