312 IAC 25-1-160
312 IAC 25-1-160 "Valley fill" defined
Cite as Ind. Admin. Code tit. 312, r. 25-1-160
Sec. 160. "Valley fill" means a fill structure consisting of any material other than coal waste and organic material that is placed in a valley
where side slopes of the existing valley measured at the steepest point are greater than twenty (20) degrees or the average slope of the profile of the
valley from the toe of the fill to the top of the fill is greater than ten (10) degrees.