The operator shall backfill, compact where advisable to insure stability or to prevent leaching of toxic materials, and grade in order to restore the approximate original contour of the land with all highwalls, spoil piles and depressions eliminated unless small depressions are needed in order to retain moisture to assist revegetation or as otherwise authorized pursuant to this act. Laws 1978, c. 10, § 7, emerg. eff. Feb. 2, 1978.
Oklahoma Legal Code