In surface coal mining where the thickness of the overburden is large relative to the thickness of the coal deposit and where the operator demonstrates that the volume of the spoil and other waste materials is more than sufficient to restore the disturbed area to approximate original contour, the operator shall, at a minimum, after restoring to approximate original contour:
Ill. Admin. Code tit. 62, § 1816.105
Amended at 11 Ill. Reg. 8131, effective July 1, 1987