§ 87.79. Disposal of excess spoil.
(a) Each application shall contain a description, including appropriate maps and cross sections, of the proposed disposal site and design of the spoil disposal structures according to § 87.131 (relating to disposal of excess spoil). The description shall include the geotechnical investigation, design, construction, operation, maintenance and removal, if appropriate, of the site and structures.
(b) The geotechnical investigation of the proposed disposal site shall include the following:
(1) The character of bedrock and any adverse geologic condition in the disposal area.
(2) A survey identifying all springs, seepage and groundwater flow observed or anticipated during wet periods in the area of the disposal site.
(3) A survey of the potential effects of subsidence of the subsurface strata due to past and future mining operations.
(4) A technical description of the rock materials to be utilized in the construction of those disposal facilities underlain by a rock drainage blanket.
(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 rock-toe buttresses or key-way cuts are required according to § 87.131(k), the description shall include the following:
(1) The number, location and depth of or test pits with respect to the size of the spoil disposal structures and subsurface conditions.
(2) Design parameters utilized to design the rock-toe buttress or key-way cuts.
Source The provisions of this § 87.79 adopted December 19, 1980, 10 Pa.B. 4789, effective July 31, 1982, 12 Pa.B. 2382; amended July 30, 1982, 12 Pa.B. 2473, effective July 31, 1982, 12 Pa.B. 2382.
Cross References This section cited in 25 Pa. Code § 86.261 (relating to program services); 25 Pa. Code § 87.65 (relating to maps and plans); and 25 Pa. Code § 87.131 (relating to disposal of excess spoil).
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