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Seneca ro osed to utilize the backfillin d final r din r d E hibi . p p g en g g sequence p a opose on x t • 19-1 and the reclamation schedule discussed in Teb 79 to achieve the proposed postmining topography on Exhibit 20-2. In summary, the annual projection of areas graded are 6~ased upon certain considerations. First, approximately two spoil rows are normally graded simultaneously once the pit configurations become regular to achieve the desired postmining land configuration and to effectively maintain topographic continuity between grading sequences. The number of spoils associated with irregular box cuts, certain inside or outside curves, short pits, foci li ty areas, and haulage ramps may exceed four spoil rows to facilitate grading. Second, the time when grading of specific spoils can begin is based upon excavation cycle times and pit configuration. Rough 6ac kfilling and grading will be kept within four spoil ridges and within 180 days, except es discussed above. Cycle times are dependent upon factors such as pit configurations, excavator performance, and customer demand. Third, once grading begins, the number of acres graded annually in a given pit is approximately equal to the number of acres disturbed annually. In certain circumstances, this generalization may not apply because of spoil material needed to achieve the designed postmining landform. For example, the backfilling and grading of box pit spoil, final highwalls, and deep ramps typically require the movement of large volumes of spoil for great distances end requires up to two years after coal • removal for final grading. ALSO, certain box cut spoil areas (where box cut material is spoiled on recoverable coal) will be temporarily ungradeable until the recoverable coal is stripped (see Exhibit 19-1). All of the acres graded in a given year are projected to be topsoiled and seeded as soon as possible based on the reclamation timetable, and will represent reclaimed acres in Table 19-7. Soil replacement will be completed within one year following final grading, provided the area is not being used for facility or monitoring-related activities (i.e., items such as, but no[ limited to ramps, deadhead routes, light use roads, haul roads, ponds, drainages, diversions, boneyerds, office, or shop areas). If final grade is achieved during fall or winter months, soil will be redistributed the following summer or fall to accommodate fall seeding. Yhen final grade is accomplished during spring or summer months, soil will be redistributed by fall to accommodate fall seeding. The most significant disturbance is advance topsoil removal which must be completed by November 1 of each year in order to allow the overburden removal operation to continue during the winter and wet spring months. The efficient removal of topsoil at Yoest is considered to be virtually impossible during the six-month period from November 1 to May 1 • of any given year. Consequently, at the end of any given year, approximately one-third of 6