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• Recontouring requirements for the active pits <br />• Necessary earthwork to establish a stable reclamation <br />topography and provide for effective drainage <br />• Material movement distances for topsoil replacement <br />• Total disturbance azea (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 remains <br />relatively constant. The only vaziance 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 azea 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 also currently a <br />. "steady state" operation. The Section 16 operations have, however, reached a point where the pit <br />will progressively become smaller and will eventually be reclaimed during the course of the <br />permit term. As the pit becomes smaller, pit depth decreases. With a reduction in pit depth, the <br />pit volume and disturbance area become progressively smaller and the volume of material to be <br />moved to recontour the active pit under a bond reclamation scenario also decreases over the <br />permit term. <br />The West Pit disturbance is a multiple-seam operation that is currently under development. <br />Pit depth is initially relatively shallow, gradually increasing over the permit term. With <br />increasing pit depth, the pit volume and disturbance azea will progressively increase and the <br />volume of material to be moved to recontour the active pit under a bond reclamation scenazio also <br />increases over the permit term. <br />C1 <br />2 <br />