35 Ill. Adm. Code 616.444
Design Requirements
Section 616
Section 616.444Â Design
Requirements
a)Â Â Â Â Â Â Â Â The owner or operator of a surface impoundment must install
two or more liners and a leachate collection system between the liners. This
requirement to install two or more liners may be satisfied by installing a top
liner designed, operated, and constructed of materials to prevent the migration
of any constituent into the liner during the period the facility remains in
operation (including any post-closure monitoring period), and a lower liner
designed, operated, and constructed of materials to prevent the migration of
any constituent through the liner during that period. For the preceding
sentence, a lower liner satisfies the construction requirement if it is constructed
of at least a 5-foot thick layer of recompacted clay or other natural material
with a permeability of no more than 1 X 10
(-7)
centimeter per
second.
b)Â Â Â Â Â Â Â Â A surface impoundment must be designed, constructed,
maintained, and operated to prevent overtopping resulting from normal or
abnormal operations; overfilling; wind and wave action; rainfall; run-on;
malfunctions of level controllers, alarms, and other equipment; and human
error.
c)Â Â Â Â Â Â Â Â A surface impoundment must have dikes that are designed, constructed,
and maintained with sufficient structural integrity to prevent massive failure
of the dikes. In ensuring structural integrity, it must not be presumed that
the liner system will function without leakage during the active life of the
surface impoundment.
d)Â Â Â Â Â Â Â Â The owner or operator must maintain the following items:
1)Â Â Â Â Â Â Â Â Records describing the contents of the impoundment; and
2)Â Â Â Â Â Â Â Â A map showing the exact location and dimensions of the
impoundment, including depth with respect to permanently surveyed benchmarks.