An undisturbed natural barrier shall be provided beginning at the elevation of the lowest coal seam to be mined and extending from the outslope for such distance as the Department determines shall be retained in place as a barrier to slides and erosion.
225 ILCS 720/3.19
Natural Barriers
P.A. 81-1015.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.