35 Ill. Adm. Code 848.401
Maintaining Financial Assurance
Section 848
Section 848.401 Maintaining
Financial Assurance
a) Except as otherwise provided in subsection (b), the owner or
operator must at all times maintain financial assurance in an amount equal to
or greater than the current approved removal cost estimate calculated pursuant
to Section 848.404.
b) Within 60 days after the occurrence of any event listed in
this subsection (b), the owner or operator must increase the total amount of
financial assurance to an amount that is equal to or greater than the current approved
removal cost estimate calculated pursuant to Section 848.404:
1) the current approved removal cost estimate increases; or
2) the value of a trust fund established pursuant to Section
848.410 decreases.