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-5367 - Disposal of Excess Spoil: Valley Fills
Universal Citation: LA Admin Code XV-5367
Current through Register Vol. 50, No. 9, September 20, 2024
A. Valley fills shall meet all of the requirements of §5365 and the additional requirements of this Section.
1. The fill shall be designed
to attain a long-term static safety factor of 1.5 based upon data obtained from
subsurface exploration, geotechnical testing, foundation design and accepted
engineering analyses.
2. A
subdrainage system for the fill shall be constructed in accordance with the
following:
a. a system of underdrains
constructed of durable rock shall meet the requirements of
§5367. A.2 d; and
i. be installed along the natural drainage
system;
ii. extend from the toe to
the head of the fill; and
iii.
contain lateral drains to each area of potential drainage or seepage;
b. a filter system to insure the
proper functioning of the rock underdrain system shall be designed and
constructed using standard geotechnical engineering methods;
c. in constructing the underdrains, no more
than 10 percent of the rock may be less than 12 inches in size and no single
rock may be larger than 25 percent of the width of the drain. Rock used in
underdrains shall meet the requirements of
§5367. A.2.d The minimum
size of the main underdrain shall be:
|
Total Amount of Fill Material |
Predominant Type of Fill Materials |
Minimum Size of Drain, in Feet |
|
|
Width |
Height |
||
|
Less than 1,000,000 yd3 |
Sandstone |
10 |
4 |
|
Do |
Shale |
16 |
8 |
|
More than 1,000,000 yd3 |
Sandstone |
16 |
8 |
|
Do |
Shale |
16 |
16 |
d.
underdrains shall consist of nondegradable, non-acid or non-toxic-forming rock
such as natural sand and gravel, sandstone, limestone or other durable rock
that will not slake in water and will be free of coal, clay or shale.
3. Spoil shall be hauled or
conveyed and placed in a controlled manner and concurrently compacted as
specified by the office, in lifts no greater than 4 feet or less if required by
the office to:
a. achieve the densities
designed to ensure mass stability;
b. prevent mass movement;
c. avoid contamination of the rock underdrain
or rock core; and
d. prevent
formation of voids.
4.
Surface water runoff from the area above the fill shall be diverted away from
the fill and into stabilized diversion channels designed to pass safely the
runoff from a 100-year, 6-hour precipitation event or larger event specified by
the office. Surface runoff from the fill surface shall be diverted to
stabilized channels off the fill which will safely pass the runoff from a
100-year, 6-hour precipitation event. Diversion design shall comply with the
requirements of §5323
5. The tops
of the fill and any terrace constructed to stabilize the face shall be graded
no steeper than 1v:20h (5 percent). The vertical distance between terraces
shall not exceed 50 feet.
6.
Drainage shall not be directed over the outslope of the fill.
7. The outslope of the fill shall not exceed
1v:2h (50 percent). The office may require a flatter slope.
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.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
