Section 312 IAC 25-6-39 - Surface mining; coal mine waste; refuse piles; construction requirementsAuthority: IC 14-34-2-1
Affected: IC 14-34
Sec. 39.
(a) Refuse piles shall be designed to conform to applicable Mine Safety and Health Administration standards, section 36 of this rule, and the additional requirements of this section.(b) Following final grading of the refuse pile, the site shall be covered with the best available nontoxic, noncombustible material, in accordance with sections 50(f) and 11 of this rule, in a manner that does not impede drainage from the underdrains. The refuse pile shall be revegetated in accordance with sections 54 through 61 of this rule.(c) Underdrains shall consist of durable rock or pipe, be designed and constructed using current, prudent engineering practices, and meet any design criteria established by the director. The underdrain system shall be designed to carry the anticipated seepage of water due to rainfall away from the excess spoil fill and seeps and springs in the foundation of the disposal area and shall be protected from piping and contamination by an adequate filter. Rock underdrains shall be constructed of durable, nonacid-forming and nontoxic-forming rock, for example: (1) natural sand and gravel;(4) other durable rock; that does not slake in water or degrade to soil material, and that is free of coal, clay, or other nondurable material. Perforated pipe underdrains shall be corrosion-resistant and shall have characteristics consistent with the long term life of the fill.
Natural Resources Commission; 312 IAC 25-6-39; filed Jun 21, 2001, 2:53 p.m.: 24 IR 3530, 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-312130125RFAReadopted filed 3/26/2019, 3:40 p.m.: 20190424-IR-312190011RFA