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• Recontouring requirements for the active pits <br />• Necessary earthwork to establish a stable reclamation topography and provide <br />for effective drainage <br />• Material movement distances for topsoil replacement <br />• Total disturbance area (including Facilities) <br />The East Pit disturbance is currently a "steady-state" operation, with the additional <br />disturbance resulting from progressive mine advance balanced by concurrent backfilling and <br />reclamation. Under these conditions, the total East Pit disturbance area and pit volume remain <br />relatively constant. The only variance occurs as a result of changes in either the natural <br />topography or necessary adjustments in the spoil area to establish the design postmining <br />topography. Pit depth remains relatively constant since the economically recoverable coal seams <br />generally parallel the natural topographic surface in this azea. With pit depth, volume and <br />disturbance area remaining essentially constant, the volume of material, which would have to be <br />moved to recontour the active pit under a bond reclamation scenario, also remains essentially <br />constant over the permit term. <br />The Section 16 disturbance is a progressive single-seam operation which is currently used <br />for blending. Spoil materials will be moved from the south end of the West Pit mining azea to <br />backfill the final pit in the Section 16 mining azea. <br />The West Pit disturbance is a multiple-seam operation that is currently a "steady-state" <br />operation. Pit depth is initially relatively shallow, gradually increasing over the permit term. With <br />increasing pit depth, the pit volume and disturbance area will progressively increase and the <br />volume of material to be moved to recontour the active pit under a bond reclamation scenario also <br />increases over the permit term. <br />2 Revision Date: 5/8/03 <br />\ Revision No. TR-56 <br />