(b) Each application shall contain the results of a geotechnical investigation of the proposed disposal site, including the following:

1. (1) The character of bedrock and any adverse geologic conditions in the disposal area,
2. (2) A survey identifying all springs, seepage, and ground- water flow observed or anticipated during wet periods in the area of the disposal site;
3. (3) A survey of the potential effects of subsidence of the subsurface strata due to past and future mining operations;
4. (4) A technical description of the rock materials to be utilized in the construction of those disposal structures containing rock chimney cores or underlain by a rock drainage blanket; and
5. (5) A stability analysis including, but not limited to, strength parameters, pore pressures and long-term seepage conditions. These data shall be accompanied by a description of all engineering design assumptions and calculations and the alternatives considered in selecting the specific design specifications and methods.

(c) If, under Section 460:20-43-24(d) of this Chapter, rock-toe buttresses or key-way cuts are required, the application shall include the following:

1. (1) The number, location, and depth of borings or test pits which shall be determined with respect to the size of the spoil disposal structure and subsurface conditions; and
2. (2) Engineering specifications utilized to design the rock- toe buttress or key-way cuts which shall be determined in accordance with (b) (5) of this Section.