Section 312IAC25-1-160. "Valley fill" defined

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"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. (Natural Resources Commission; 312 IAC 25-1-160; filed Jun 21, 2001, 2:53 p.m.: 24 IR 3427, eff Dec 1, 2001; readopted filed May 29, 2007, 9:51 a.m.: 20070613-IR-312070146RFA; readopted filed Sep 19, 2013, 10:12 a.m.: 20131016-IR-312130125RFA)

                    
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