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f) Topsoil replacement <br />• g) Revegetation <br />Reclamation Costs Categories <br />Seneca's experience in reclaiming mined land has shown, for the purpose of estimating costs, contrail <br />recamation 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 />Backfilling and Grading <br />• The first major phase in the recamation of mined land is backflling and grading the open pits. Although this <br />process is discussed in detail in the Backfilling and Grading Plan found in Chapter 12, 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. OverburdeNcoal bore holes were located in the 1994 open pit <br />areas and used to determine an "average" or "typical" depth of overburden. See Exhibit 12-1 (Operations <br />Plan) for pit locations as of 1994. Values calculated from the boreholes were used in a range diagram <br />computer program called RANGER. This range diagram was the basis for future volume celwlafions. A pit <br />width of 110 feet was used for all pit areas. Postmine slopes were then superimposed on the diagrams. For <br />the sake of continuity, it was estimated that all spoil would be graded towards the open pit at slopes between <br />5h:ty and 10h:1v. All highwall slopes would be reduced to slopes between 2.5h:ty and 5h:1v. This <br />produced a final topography that could not only be revegetated, but would also allow drainage to flow <br />through the pil area without impounding water. It was also assumed that in all cases there would be four <br />standing spoils behind the open pk. This is a very conservative estimate because, in most cases, <br />• reclamation grading is curcent to within two spoil piles. <br />TR-37 1349 Revised 04/05 <br />