Louisiana Administrative Code
Title 43 - NATURAL RESOURCES
Part XV - Office of Conservation-Surface Mining
Subpart 5 - Permanent Program Performance Standards
Chapter 53 - Permanent Program Performance Standards: Surface Mining Activities
Section XV-5369 - Disposal of Excess Spoil: Head-of-Hollow Fills
Universal Citation: LA Admin Code XV-5369
Current through Register Vol. 50, No. 9, September 20, 2024
A. Disposal of spoil in the head-of-hollow fill shall meet all standards set forth in §5365 and the additional requirements of this Section.
1. The fill shall be designed
to completely fill the disposal site to the approximate elevation of the
ridgeline. A rock-core chimney drain may be utilized instead of the subdrain
and surface diversion system required for valley fills. If the crest of the
fill is not approximately at the same elevation as the low point of the
adjacent ridgeline, the fill must be designed as specified in
§5367 with diversion of runoff around the
fill. A fill associated with contour mining and placed at or near the coal
seam, and which does not exceed 250,000 cubic yards, may use the rock-core
chimney drain.
2. The alternative
rock-core chimney drain system shall be designed and incorporated into the
construction of head-of-hollow fills as follows.
a. The fill shall have, along the vertical
projection of the main buried stream channel or rill, a vertical core of
durable rock at least 16 feet thick which shall extend from the toe of the fill
to the head of the fill, and from the base of the fill to the surface of the
fill. A system of lateral rock underdrains shall connect this rock core to each
area of potential drainage or seepage in the disposal area. Rocks used in the
rock core and underdrains shall meet the requirements of
§5367. A 2
b. A filter system to ensure the proper
functioning of the rock core shall be designed and constructed using standard
geotechnical engineering methods.
c. The grading may drain surface water away
from the outslope of the fill and toward the rock core. The maximum slope of
the top of the fill shall be 1v:33h (3 percent). Instead of the requirements of
§5365 G, a drainage pocket may be
maintained at the head of the fill during and after construction, to intercept
surface runoff and discharge the runoff through or over the rock drain, if
stability of the fill is not impaired. In no case shall this pocket or sump
have a potential for impounding more than 10,000 cubic feet of water. Terraces
on the fill shall be graded with a 3 to 5 percent grade toward the fill and a 1
percent slope toward the rock core.
3. The drainage control system shall be
capable of passing safely the runoff from a 100-year, 6-hour precipitation
event, or larger event specified by the office.
AUTHORITY NOTE: Promulgated in accordance with R.S. 30:901-932.
Disclaimer: These regulations may not be the most recent version. Louisiana may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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