PERMFILE64096

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 1/26/2005
• Section_Exhibit Name: Tab 13 Postmining Land Use
• Media Type: D
• Archive: Yes

Direct Costs
1. Backf filling and grading •
2. Topsoil replacement
3. Aevegetation
9. Facility reclamation
Indirect Costs
1. Mobilization and demobilization
2. Engineering redesign fee
3. Contractor profit and overhead
4. Reclamation management fee
Hackfilling and Gzading
The first major phase in the reclamation of mined land is backfilling and grading the
open pits. Although this process is discussed in detail in the Backfilling and Grading
Plan found in Chapter 12, an unplanned cessation of mining will usually cause some
deviation from the original plan. Early cessati on generally affects the estimated
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volumetric calculations •
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The first step is the determination of volumes. Overburden/coal bore holes were located
in the 1999 open pit areas and used to determine an 'average^ or ^typical^ depth of
overburden. See Exhibit 12-1 for pit location. Values calculated from the bore holes
were used in a range diagram computer program called RANGER. This range diagram was the
basis foz future Volume calculations. A pit width of 110 feet was used for all pit
areas. Postmine slopes were then superinq~osed on the diagrams. For the sake of
continuity, it was estimated that all spoil would be graded towards the open pit at
slopes between Sh :lv and lOh:ly. All highwall slopes would be reduced to slopes between
2.Sh:ly and Sh :lv. This produced a final topography that could not only be revegetated,
but would also allow drainage to flow through the pit area without impounding water. It
was also assumed that in all cases there would be four standing spoils behind the open
pit. This is a very conservative estimate because, in most cases, reclamation grading is
current to within two spoil piles.
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13-52 Revised 12/01/93