35 Ill. Adm. Code 734.300
General
Section 734.300 General
Unless the owner or operator submits a report pursuant to
Section 734.210(h)(3) of this Part demonstrating that the most stringent Tier 1
remediation objectives of 35 Ill. Adm. Code 742 for the applicable indicator
contaminants have been met, the owner or operator must investigate the site,
conduct corrective action, and prepare plans, budgets, and reports in
accordance with the requirements of this Subpart C.