Ill. Admin. Code tit. 62, § 1817.102 - Backfilling and Grading: General Grading Requirements
a) Disturbed areas shall be backfilled and
graded to:
1) Achieve the approximate original
contour, except as provided in subsection (k);
2) Eliminate all highwalls, spoil piles, and
depressions, except as provided in subsection (h) (small depressions) and in
subsection (k)(2) (previously mined highwalls);
3) Achieve a post-mining slope that does not
exceed either the angle of repose or such lesser slope as is necessary to
achieve a minimum long-term static safety factor of
1.3 and to prevent
slides;
4) Minimize erosion and
water pollution both on and off the site in accordance with Sections
1817.42
and
1817.95;
and
5) Support the approved
post-mining land use.
b)
Spoil, except as provided in subsection (l), and except excess spoil disposed
of in accordance with Sections
1817.71
through
1817.74,
shall be returned to the mined-out area.
c) Spoil and waste materials shall be
compacted to ensure stability or to prevent leaching of toxic
materials.
d) Spoil may be placed
on the area outside the mined-out area in nonsteep slope areas to restore the
approximate original contour by blending the spoil into the surrounding terrain
if the following requirements are met:
1) All
vegetative and organic material shall be removed from the area.
2) The topsoil on the area shall be removed,
segregated, stored, and redistributed in accordance with Section
1817.22.
3) The spoil shall be backfilled and graded
on the area in accordance with the requirements of this Section.
e) Disposal of coal processing
waste and underground development waste in the mined-out area shall be in
accordance with Sections
1817.81
and
1817.83,
except that a long-term static safety factor of
1.3 shall be
achieved.
f) Exposed coal seams,
acid- and toxic-forming materials, and combustible materials exposed, used, or
produced during mining shall be adequately covered with nontoxic and
noncombustible material, or treated, to control the impact on surface and
ground water in accordance with Section
1817.41,
to prevent sustained combustion, and to be in compliance with the revegetation
requirements of Section
1817.111(a)
and the approved post-mining land use.
g) Cut-and-fill terraces may be allowed by
the Department where:
1) Needed to conserve
soil moisture to ensure revegetation, ensure stability, and control erosion on
final graded slopes, if the terraces are compatible with the approved
post-mining land use, in accordance with Sections 1817.41, 1817.95 and
1817.111; or
2) Specialized
grading, foundation conditions, or roads are required for the approved
post-mining land use, in which case the final grading may include a terrace to
ensure the safety, stability, and erosion control necessary to implement the
post-mining land use plan.
h) Small depressions may be constructed if
they are needed to minimize erosion, create and enhance wildlife habitat, or
assist revegetation by retaining moisture, in accordance with Sections 1817.71,
1817.95, 1817.97 and 1817.111.
i)
Permanent impoundments may be approved if they meet the requirements of
Sections
1817.49 and
1817.56.
j) Preparation of final graded surfaces shall
be conducted in a manner that minimizes erosion in accordance with Section
1817.45
and provides a surface for replacement of topsoil that will minimize slippage
such as discing and scarification.
k) The post-mining slope may vary from the
approximate original contour when approval is obtained from the Department for:
1) A variance from approximate original
contour requirements in accordance with 62 Ill. Adm. Code
1785.16;
or
2) Incomplete elimination of
highwalls in previously mined areas in accordance with Section
1817.106.
l) Regrading of settled and
revegetated fills to achieve approximate original contour at the conclusion of
underground mining activities shall not be required if the conditions of
subsection (l)(1) or (l)(2) are met.
1)
A) Settled and revegetated fills shall be
composed of spoil or nonacid- or nontoxic-forming underground development
waste.
B) The spoil or underground
development waste shall not be located so as to be detrimental to the
environment, to the health and safety of the public, or to the approved
post-mining land use.
C) Stability
of the spoil or underground development waste shall be demonstrated through
standard geotechnical analysis to be consistent with backfilling and grading
requirements for material on the solid bench (1.3 static safety
factor) or excess spoil requirements for material not placed on a solid bench
(1.5 static safety
factor).
2) If it is determined by the
Department that disturbance of the existing spoil or underground development
waste would increase environmental harm or adversely affect the health and
safety of the public, the Department may allow the existing spoil or
underground development waste pile to remain in place. The Department may
require stabilization of such spoil or underground development waste in
accordance with the requirements of subsections (l)(1)(A) through
(l)(1)(D).
Notes
Amended at 11 Ill. Reg. 8250, effective July 1, 1987
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