(225 ILCS 720/4.09) (from Ch. 96 1/2, par. 7904.09)
Sec. 4.09.
Hydrology.
The operator shall minimize the disturbances of
the prevailing hydrologic balance at the minesite and in associated offsite
areas and to the quantity of water in surface and ground water systems both
during and after underground coal mining operations and during reclamation by-
(a) avoiding acid or other toxic mine drainage by such measures as, but
not limited to-
(1) preventing or removing water from contact with toxic-producing deposits;
(2) treating drainage to reduce toxic content which adversely affects
downstream water on being released to water courses;
(3) casing, sealing, or otherwise managing boreholes, shafts, and wells
to keep acid or other toxic drainage from entering ground and surface waters; and
(b) conducting underground mining operations so as to prevent, to the
extent possible using the best technology currently available, additional
contributions of suspended solids to streamflow or runoff outside the permit
area (but in no event shall such contributions be in excess of requirements
set by applicable State or Federal law), and avoiding channel deepening
or enlargement in operations requiring the discharge of water from mines.
(Source: P.A. 81-1015.)
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