IL SB0546

Requires the Pollution Control Board to adopt groundwater monitoring amendments within 180 days for all clean construction or demolition debris fill operations and uncontaminated soil fill operations.

Groundwater monitoring requirements must detect and prevent exceedances of Class I groundwater quality standards and include monitoring frequency, well location methodology, installation within one year, post-closure monitoring for at least 5 years, remedial action procedures, and financial assurance.

Exempts operations that completed post-closure maintenance before the bill's effective date: clean construction/demolition debris operations with EPA written notification of permit termination, and uncontaminated soil operations with professional certification and affidavit that post-closure maintenance is no longer necessary.

Modifies existing provisions in the Environmental Protection Act (415 ILCS 5/22.51 and 22.51a) regarding fill operations in quarries, mines, and other excavations.

Takes effect immediately upon becoming law.