Ill. Admin. Code tit. 32, § 601.340
AGENCY NOTE: The State will implement the institutional control plan, that will physically control access to the disposal site following transfer of control of the disposal site from the licensee and termination of the license. The institutional control program shall include, but not be limited to, carrying out an environmental monitoring program at the disposal site, periodic surveillance, minor custodial care, other requirements as determined by the State, and administration of funds to cover the costs for these activities. Under 10 CFR 61.59, controls may not be relied upon for more than 100 years following transfer of control of the disposal site by the licensee. It is the Agency's intention that controls will remain as long as they are necessary to protect the public health and safety and the environment.