Authority: IC 14-34-2-1

Affected: IC 14-34

Sec. 54. (a) Each application shall contain descriptions, including appropriate maps and cross section drawings, of the proposed disposal site and design of the spoil disposal structures according to 312 IAC 25-6-34.

(b) For excess spoil disposal areas other than box cut spoil, the plans shall include the following:

1. (1) A description of the geotechnical investigation design, construction, operations, maintenance, and removal, if appropriate, of the site and structures.

2. (2) The results of a geotechnical investigation of the proposed disposal site, including the following:

   1. (A) The character of bedrock and any adverse geologic conditions in the disposal area.
   2. (B) A survey identifying all springs, seepage, and ground water flow observed or anticipated during wet periods in the area of the disposal site.
   3. (C) A survey of the potential effects of subsidence of the subsurface strata due to past and future mining operations.

   4. (D) A technical description of the rock materials to be utilized in the construction of those disposal structures:

      1. (i) containing rock chimney cores; or
      2. (ii) underlain by a rock drainage blanket.

   5. (E) A stability analysis, including, but not limited to:

      1. (i) strength parameters;
      2. (ii) pore pressures; and
      3. (iii) long term seepage conditions.
   6. These data shall be accompanied by a description of all engineering design assumptions and calculations and the alternatives considered.

3. (3) If, under 312 IAC 25-6-34, rock-toe buttresses or key-way cuts are required, the application shall include the following:

   1. (A) The number, location, and depth of borings or test pits that shall be determined with respect to the size of the spoil disposal structure and subsurface conditions.
   2. (B) Engineering specifications utilized to design the rock-toe buttress or key-way cut that shall be determined in accordance with subdivision (2)(E).

(c) Where box cut spoil is proposed to be considered as excess spoil, the application shall contain the following:

1. (1) Appropriate maps, plans, and cross sections that demonstrate that over the life of the mining operation the box cut spoil is not needed to restore the approximate original contour.
2. (2) Plans for the design, construction, and reclamation of the box cut spoil area that meet the requirements of 312 IAC 25-6-34.

(Natural Resources Commission; 312 IAC 25-4-54; filed Jun 21, 2001, 2:53 p.m.: 24 IR 3459, 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; readopted filed Mar 26, 2019, 3:40 p.m.: 20190424-IR-312190011RFA; readopted filed Mar 25, 2025, 9:50 a.m.: 20250423-IR-312240574RFA)