PERMFILE113794

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Design Report Temporary Sedimentation Structure Pond 009
• Section_Exhibit Name: Tab 13 Attachment 13-5
• Media Type: D
• Archive: No

to the pond excavation. During passage of the 10-year, 24-hour storm the spillway does
not discharge sediment downstream nor is there any flow through the emergency spillway.
The pond will be a temporary structure, and therefore has been designed to safely pass the
flow from the 25-year, 24-hour precipitation event. The final ponding capacity will be
constructed to contain approximately four years of sediment storage. Ih addition, the
spillway is designed and constructed to safely discharge the 25-year, 24-hour storm event.
The embankment will be constructed to be stable and provide adequate freeboard.
Therefore, based on the design, this structure complies with the appropriate regulations
for a temporary sediment structure. Peabody Coat Company wilt periodically inspect the
structure for sediment storage, structural integrity, and hazardous conditions.
Maintenance and remedial work will be performed in accordance with the approved mine
permit.
Construction Plan. The construction of Sediment Pond 009 will be performed in such a
manner to adhere to standard and sound engineering and construction practices. The
following narrative lists the various phases of construction and a brief description for
each phase:
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standing and fallen will be cleared and disposed of without damage to adjoining
property.
2. Topsoil Removal and Placement in Designated Areas - All recoverable topsoil
containing organic or other deleterious material will be removed and placed in
designated areas. Estimated depths of topsoil that will be removed are shown on
Exhibit 9-1 "Soil Types and Topsoil Salvage Map" in the Seneca II-W Permit
Application. All topsoil removal and placement operations will 6e performed in
actor da nee with Colorado Rules and Regulations.
3. Earthwork All work covered by this section consists of hauling, wetting or dr yinq,
rolling, and other operations for constructing and preparing the earthwork in
accordance with standard sound engineering and construction practices.
A. Excavation. Excavation will consist of the removal and satisfactory placement
of all materials to lines, grades, and cross section for the construction of
Sediment Pond 009. Grading will be done to conform with the typical sections.
1. Slopes. Slopes of all excavations will be cut true and straight and all
loose stones, boulders, roots, and stumps in the slopes will be removed.
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13-5-10