2011-01-13_PERMIT FILE - C1981038A ‎(6)‎

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 1/13/2011
• Doc Name: page 1 to 55
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -
MINIMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS.
• The emergency spillways of Pond Nos. 1 through 4 will safely
discharge run-off from a 100 year precipitation event, with the
spillways flowing at a 3-foot depth, leaving one foot freeboard
to the top of the dam. For calculations of spillway capacity
and apron design see Ponds, Impoundments, and Dams Appendix in
Volume 8A.
The steel bin wall construction lends itself to minimal
settlement. The bottom of the bin wall dam was constructed on
original ground, minimizing the consolidation of soil beneath
the dam, thereby limiting settlement. The backfill within the
bin walls does settle but may be refilled during the periodic
maintenance program. The dam height has not been raised over
design height because of the minimal settlement.
The bin wall dam construction is not of an embankment nature.
The bins are 12 feet wide. The dam is 19 feet high. The
structure does not have any slope embankments, due to the bin
wall-construction. Vegetative and organic matter was removed
before the dam was constructed. All fill material used within
the bin walls is free of sod, roots, and other vegetative
matter, frozen soil and coal-development waste. Please refer to
Construction Specifications within the Ponds, Impoundments, 'and
Dams Appendix in Volume 8A for specific detail on placement of
fill. The backfill was placed in 4-6 inch layers and compacted
using power tampers. It was compacted to approximately 908 of
maximum dry density.
• Sedimentation Pond - Timber Storaoe Area
One sedimentation pond is located immediately downstream and
east of the timber storage area. It is located in the NWi-<NW. of
Section 25, T.13.S., R.92.W., 6th P.M.
Drainage ditches have been installed to intercept surface runoff
from the timber storage area and direct it to the sedimentation
pond.
The dam is constructed using compacted earth fill. Plans and
specification are as shown in Ponds, Impoundments, and Dams
Appendix in Volume 8A. The pond was constructed during April,
1978.
The timber storage area dam is an existing structure and is
located immediately downstream of the timber storage area. It
conforms to 9.05.2, .5, .6, .7 and .17. It is not located
within any stream channel and discharge, if any, drains into
Steven's Gulch. The sediment volume and 10-vr., 24-hr. inflow
is calculated in the Ponds, Impoundments, and Dams Appendix in
Volume 8A. The sediment volume is 0.27 ac-ft and the 10-yr,
29-hr. inflow is 0.37 acre feet. The total required is 0.27 +
0.37 = 0.64 ac-ft.
This pond is equipped with a conduit de-watering device as shown
on Map No. 8A-3. Sediment volumes are monitored and cleaned

• following the Mine Sediment Monitoring Program.
Permit Renewal - 21 - 01/03
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