10 CSR 40-3.060 - Requirements for the Disposal of Excess Spoil
PURPOSE: This amendment incorporates by reference the
federal regulations that sets forth the requirements for the disposal of excess
PUBLISHER'S NOTE: The secretary of state has determined that the publication of the entire text of the material which is incorporated by reference as a portion of this rule would be unduly cumbersome or expensive. This material as incorporated by reference in this rule shall be maintained by the agency at its headquarters and shall be made available to the public for inspection and copying at no more than the actual cost of reproduction. This note applies only to the reference material. The entire text of the rule is printed here.
(A)
1. Leachate and surface runoff
from the fill will not degrade surface or ground waters or exceed the effluent
limitations of
10
CSR 40-3.040(2);
2. The fill is stable;
and
3. The land mass designated as the
disposal area is suitable for
(B) The fill and appurtenant
structures shall be designed using recognized professional standards, certified
by a registered professional engineer experienced in the design of earth and
rock fills and approved in the
(C) All vegetative and organic
materials shall be removed from the disposal area and the
(D)
(E) If placed on a
(F) The
(G) The final configuration of the
fill must be suitable for postmining land uses approved in accordance with
10 CSR
40-3.130(1), except that no
depressions or impoundments shall be allowed on the completed
fill.
(H) Excess
(I) Terraces may be utilized to
control erosion and enhance stability if approved in the
(J) Where the
(K) Fill
Inspection.
1. A registered professional
engineer or other qualified professional specialist under the direction of a
registered professional engineer, approved in the
A. Removal of all organic material
and
B. Placement of underdrainage
systems;
C. Installation of surface
drainage systems;
D. Placement and
E. Revegetation.
2. Within two (2) weeks after each
inspection, the registered professional engineer shall provide the
3. Certified
report.
A. The certified report on the
drainage system and protective filters shall include color photographs taken
during and after construction, but before underdrains are covered with excess
B. Where excess durable rock
C. The photographs accompanying
each certified report shall be taken in adequate size and number with enough
terrain or other physical features of the site shown to provide a relative
scale to the photographs and to specifically and clearly identify the
site.
4. A copy of the report shall be
retained at the minesite.
(L)
1. Placed in accordance with
10
CSR 40-3.080(4);
2. Demonstrated to be nontoxic-
and nonacid-forming; and
3. Demonstrated to be consistent
with the design stability of the fill.
(M) If the disposal area contains
springs, natural or man-made watercourses, or wet weather seeps, an underdrain
system consisting of durable rock shall be constructed from the wet areas in a
manner that prevents infiltration of the
(N) The foundation and abutments
of the fill shall be stable under all conditions of construction and operation.
Sufficient foundation investigation and laboratory testing of foundation
materials shall be performed in order to determine the design requirements for
stability of the foundation. Analyses of foundation conditions shall include
the effect of underground mine workings, if any, upon the stability of the
structure.
(O) Excess
(2) Valley Fills. Valley fills
shall meet all of the requirements of section (1) of this rule and the
additional requirements of this section.
(A) The fill shall be designed to
attain a long-term static
(B) A subdrainage system for the
fill shall be constructed in accordance with the following:
1. A system of underdrains
constructed of durable rock shall meet the requirements of paragraph (2)(B)4.
of this rule and shall-
A. Be installed along the natural
drainage system;
B. Extend from the toe to the head
of the fill; and
C. Contain lateral drains to each
area of potential drainage or seepage;
2. A filter system to insure the
proper functioning of the rock underdrain system shall be designed and
constructed using standard geotechnical engineering methods;
3. In constructing the
underdrains, no more than ten percent (10%) of the rock may be less than twelve
inches (12") in size and no single rock may be larger than twenty-five percent
(25%) of the width of the drain. Rock used in underdrains shall meet the
requirements of paragraph (2)(B)4. of this rule. The minimum size of the main
under-drain shall be-
Total Amount of Fill
Material
Predominant Type of Fill
Material
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
4. Underdrains shall consist of
nondegradable, nonacid-and nontoxic-forming rock, such as natural sand and
gravel, sandstone, limestone, or other durable rock that will not slake in
(C)
1. Achieve the densities designed
to ensure mass stability;
2. Prevent mass
movement;
3. Avoid contamination of the rock
underdrain or rock core; and
4. Prevent formation of
voids.
(D) Surface
(E) The tops of the fill and any
terrace constructed to
(F) Drainage shall not be directed
over the
(G) The
(3) Head-of-Hollow Fills. Disposal
of
(A) 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
(B) The alternative rock-core
chimney drain system shall be designed and incorporated into the construction
of head-of-hollow fills as follows:
1. The fill shall have, along the
vertical projection of the main buried stream channel or rill, a vertical core
of durable rock at least sixteen feet (16') 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
subsection (2)(B) of this rule;
2. A filter system to ensure the
proper functioning of the rock core shall be designed and constructed using
standard geotechnical engineering methods; and
3. The grading may drain surface
(4) Durable Rock Fills. In lieu of
the requirements of sections (2) and (3) of this rule, approval may be given in
the
(A)
1. The method of
2. Loads of noncemented clay
shale, clay
(B) Stability Analyses and Bank
Design.
1. Stability analyses shall be
made by the registered professional engineer. Parameters used in the stability
analyses shall be based on adequate field reconnaissance, subsurface
investigations, including borings and laboratory tests.
2. The
Case
Design
Condition
Minimum Factor of
Safety
I
End of
construction
1.5
II
Earthquake
1.1
(C) The design of a
1. Anticipated discharge from
springs and seeps and due to precipitation shall be based on records, field
investigations, or both, to determine seasonal variation. The design of the
internal drainage system shall be based on the maximum anticipated
discharge.
2. All granular material used for
the drainage system shall be free of clay and consist of durable particles,
such as natural sands and gravels, sandstone, limestone, or other durable rock,
which will not slake in
3. The internal drain shall be
protected by a properly designed and constructed filter system using standard
geotechnical engineering methods.
(D) Surface
(E) The top surface of the
completed fill shall be graded so that the final
(F) Surface runoff from the
(G) Terraces shall be constructed
on the
1. The
2. To control surface runoff, each
terrace bench shall be graded to a
3. Terrace ditches shall have a
five percent (5%)
Notes
*Original authority: 444.530, RSMo 1979, amended 1983, 1990, 1993, 1995 and 444.810, RSMo 1979, amended 1983, 1993, 1995.
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