30 CFR § 77.216-2 Water, sediment, or slurry impoundments and impounding structures; minimum plan requirements; changes or modifications; certification.
(a) The plan specified in §77.216, shall
contain as a minimum the following information:
(1) The name and address of the persons owning, operating
or controlling the impoundment or impounding structure; the name associated
with the impoundment or impounding structure; the identification number of
the impounding structure as assigned by the District Manager; and the
identification number of the mine or preparation plant as assigned by
MSHA.
(2) The location of the structure indicated on the most
recent USGS 7 1/2 minute or 15 minute topographic quadrangle map, or a
topographic map of equivalent scale if a USGS map is not available.
(3) A statement of the purpose for which the structure is
or will be used.
(4) The name and size in acres of the watershed affecting
the impoundment.
(5) A description of the physical and engineering
properties of the foundation materials on which the structure is or will be
constructed.
(6) A statement of the type, size, range, and physical and
engineering properties of the materials used, or to be used, in constructing
each zone or stage of the impounding structure; the method of site
preparation and construction of each zone; the approximate dates of
construction of the structure and each successive stage; and for existing
structures, such history of construction as may be available, and any record
or knowledge of structural instability.
(7) At a scale not to exceed 1 inch=100 feet, detailed
dimensional drawings of the impounding structure including a plan view and
cross sections of the length and width of the impounding structure, showing
all zones, foundation improvements, drainage provisions, spillways, diversion
ditches, outlets, instrument locations, and slope protection, in addition to
the measurement of the minimum vertical distance between the crest of the
impounding structure and the reservoir surface at present and under design
storm conditions, sediment or slurry level, water level and other information
pertinent to the impoundment itself, including any identifiable natural or
manmade features which could affect operation of the impoundment.
(8) A description of the type and purpose of existing or
proposed instrumentation.
(9) Graphs showing area-capacity curves.
(10) A statement of the runoff attributable to the
probable maximum precipitation of 6-hour duration and the calculations used
in determining such runoff.
(11) A statement of the runoff attributable to the storm
for which the structure is designed and the calculations used in determining
such runoff.
(12) A description of the spillway and diversion design
features and capacities and calculations used in their determination.
(13) The computed minimum factor of safety range for the
slope stability of the impounding structure including methods and
calculations used to determine each factor of safety.
(14) The locations of surface and underground coal mine
workings including the depth and extent of such workings within the area 500
feet around the perimeter, shown at a scale not to exceed one inch=500
feet.
(15) Provisions for construction surveillance,
maintenance, and repair of the impounding structure.
(16) General provisions for abandonment.
(17) A certification by a registered engineer that the
design of the impounding structure is in accordance with current, prudent
engineering practices for the maximum volume of water, sediment, or slurry
which can be impounded therein and for the passage of runoff from the
designed storm which exceeds the capacity of the impoundment; or, in lieu of
the certification, a report indicating what additional investigations,
analyses, or improvement work are necessary before such a certification can
be made, including what provisions have been made to carry out such work in
addition to a schedule for completion of such work.
(18) Such other information pertaining to the stability of
the impoundment and impounding structure which may be required by the
District Manager.
(b) Any changes or modifications to plans for water, sediment, or
slurry impoundments or impounding structures shall be approved by the
District Manager prior to the initiation of such changes or
modifications.
