16 Tex. Admin. Code § 12.371 - Coal Processing Waste Banks: Construction Requirements
(a) Coal processing waste banks shall be
constructed in compliance with §§
12.363 and
12.364 of this title (relating to
Disposal of Excess Spoil: General Requirements, and to Disposal of Excess
Spoil: Valley Fills), except to the extent that the requirements of those
sections are varied in this section.
(b) Coal processing waste banks shall have a
minimum static safety factor of 1.5.
(c) Compaction requirements during
construction or modification of all coal processing waste banks shall meet the
requirements of this subsection, instead of those specified in §12.364(d)
of of this title (relating to Disposal of Excess Spoil: Valley Fills). The coal
processing 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 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 office of the Commission, 1701 North Congress Avenue, Austin,
Texas.
(d) Following
grading of the coal processing 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 §
12.335(e) of
this title (relating to Topsoil: Removal), and in a manner that does not impede
flow from subdrainage systems. The coal processing waste bank shall be
revegetated in accordance with §§
12.390-12.393 and
12.395 of this title (relating to
Revegetation: General Requirement, to Revegetation: Use of Introduced Species,
to Revegetation: Timing, to Revegetation: Mulching and Other Soil Stabilizing
Practices, 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 §§
12.390-12.393 and
12.395 of this title will be
met.
Notes
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