16 Tex. Admin. Code § 12.538 - Coal Mine Waste Banks: Construction Requirements
(a) Coal mine waste banks shall be
constructed in compliance with §
12.531 and §
12.532 of this title (relating to
Disposal of Underground Development Waste and Excess Spoil: General
Requirements, and to Disposal of Underground Development Waste and Excess
Spoil: Valley Fills), except to the extent the requirements of those sections
are specifically varied in this section.
(b) Coal mine waste banks shall have a
minimum static factor of safety of 1.5.
(c) Compaction requirements during
construction or modification of all coal mine waste banks shall meet the
requirements of this subsection, instead of those specified in §
12.532(d) of
this title (relating to Disposal of Underground Development Waste and Excess
Spoil: Valley Fills). The coal mine waste shall be:
(1) spread in layers no more than 24 inches
in thickness; and
(2) compacted to
attain 90% of the maximum dry density in order to prevent spontaneous
combustion and to provide the strength required for stability of the coal
processing waste bank. Dry densities shall be determined in accordance with the
American Association of State Highway and Transportation Officials (AASHTO)
Specification T99-74 (Twelfth Edition) (July, 1978) or an equivalent method.
AASHTO T99-74 is on file and available for inspection at the Commission office,
1701 N. Congress Avenue, Austin, Texas.
(d) Following grading of the coal mine waste
bank, the site shall be covered with a minimum of 4 feet of the best available
non-toxic and non-combustible material, in accordance with §
12.505(e) of
this title (relating to Topsoil: Removal), and in a manner that does not impede
flow from subdrainage systems. The coal mine waste bank shall be revegetated in
accordance with §§
12.555-12.560 of this title (relating to
Revegetation: General Requirements, to Revegetation: Use of Introduced Species,
to Revegetation: Timing, to Revegetation: Mulching and Other Soil Stabilizing
Practices, to Revegetation: Grazing, and to Revegetation: Standards for
Success). The Commission may allow less than 4 feet of cover material based on
physical and chemical analyses which show that the requirements of §§
12.555-12.560 of this title (relating to
Revegetation: General Requirements, to Revegetation: Use of Introduced Species,
to Revegetation: Timing, to Revegetation: Mulching and Other Soil Stabilizing
Practices, to Revegetation: Grazing, and to Revegetation: Standards for
Success) will be met.
Notes
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