220 ILCS 50/9

(a) When it is shown by competent evidence in any action for damages to facilities that such damages resulted from excavation or demolition and that the excavator engaged in such excavation or demolition failed to comply with the provisions of this Act, that excavator shall be deemed prima facie guilty of negligence. (b) When it is shown by competent evidence in any action for damages to excavators, material, or equipment brought by excavators undertaking excavation or demolition acting in compliance with the provisions of this Act that such damages resulted from the failure of underground utility facility owners or operators to comply with the provisions of this Act, those underground utility facility owners or operators shall be deemed prima facie guilty of negligence.