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REV99539
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REV99539
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Entry Properties
Last modified
8/25/2016 3:23:24 AM
Creation date
11/22/2007 12:27:48 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
Revision
Doc Date
5/10/2005
Doc Name
Revised Pages Tab 21 & 25
From
Seneca Coal Company
To
DMG
Type & Sequence
PR5
Media Type
D
Archive
No
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Reclamation Costs Categories <br />Seneca's experience in reclaiming mined land has shown, for the purpose of estimating costs, contract <br />reclamation activities can be grouped into the following categories: <br />Direct Costs <br />1. Backfilling and grading <br />2. Topsoil replacement <br />3. Revegetation <br />4. Facility reclamation <br />Indirect Costs <br />1. Mobilization and demobilization <br />2. Engineering redesign fee <br />3. Contractor profit and overhead <br />4. Reclamation management fee <br />5. Public liability insurance <br />6. Contractor's performance bond <br />• <br />Backfilling and Grading • <br />The first major phase in the reclamation of mined land is backfilling and grading the open pits. Although <br />this process is discussed in detail in the Backfilling and Grading Plan found in Tab 20, an unplanned <br />cessation of mining will usually cause some deviation from the original plan. Early cessation generally <br />affects the estimated postmining topography, postmining drainages, and the resulting volumetric <br />calculations. <br />The first step is the determination of volumes. Odginally, a computer program called STAMP was used <br />to determine the volume of material and an "average" depth of overburden in the last pit in any one <br />year. The greatest volume then determined this particular year would be the "worst case" scenario. <br />Overburden and coal thickness values, as determined by STAMP, were used in a range diagram <br />computer program called RANGER. This range diagram was the basis for future volume calculations. A <br />pit width of 110 feet was used for all pit areas. <br />Postmine slopes were then superimposed on the diagrams. For the sake of continuity, it was estimated <br />that all spoil would be graded towards the open pit at 5H:iV slopes. All highwall slopes would be <br />reduced to 5H:1 V. This produced a final topography that could not only be revegetated, but would also <br />allow drainage to flow through the pit area without impounding water. It was also assumed that in all <br />cases there would be four standing spoils behind the open pit. This is a very conservative estimate • <br />because, in most cases, reclamation grading is current to within two spoil piles. <br />PR-05 2 Revised 05/05 <br />
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