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These variance areas and proposed schedule are depicted on Exhibit 19-1A, Backfilling and Grading • Schedule. The corresponding mining schedule is shown on Exhibit 12-3, Operations Plan. A mine progression and sequencing dates (scheduling) are for estimation purposes only. The original dragline planning was developed to meet coal delivery contracts and could fluctuate based on power plant demand, coal orders could increase o decrease on a monthly basis. The introduction of the Highwall Miner to the operations adds another variable to the overall timing presented on Exhibits 12-3, 12-3a, and 12-3b. This current mine plan is based on meeting existing coal delivery contracts. The highwall miner is scheduled to begin operating at the Yoast Mine in the spring of 2004 and then proceed to II-W in late spring/early summer of 2005. This scheduling depends on a number of factors that rely on operating conditions. The mine plan is based on the highwall miner penetrating 600 feet into the coal seams. The timing for moving to other blocks could change depending on pit and coal seam conditions. For instance: - if the average highwall miner penetration distance is less or more than designed 1600 feet penetration), the timing will change or, - if the coal seam characteristics or pit conditions encountered are different than predicted and won't allow coal recovery or conversely will allow additional coal recovery, the timing will change • These changes to the timing could be significant and could change the overall timing Iby year) of the projected mine plan and ultimately the final reclamation schedule. 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 Seneca II-W 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 the coal acreage to be mined during the next year will have been disturbed by topsoil removal activities. The total annual disturbed acreage figures in the table include the coal areas mined and the advance topsoil removed areas, as well as the other disturbances including spoil areas, existing and proposed haul roads, power lines, storage yards, and facilities. In order to avoid the confusion created by too many overlapping yearly lines, only the graded areas for each year are shown on the Backfilling and Grading Schedule, Exhibit 19-1 and 19-1A. The facilities including utility lines, haul roads, drainage and sediment control structures, and the dragline erection pad are illustrated on Exhibits 12-2 and 12-2a and Exhibits 13-1 and 13-1A, and are described in Tab • 13. The areas of land that will be disturbed through the five-year permit term are shown on Exhibits 20-1 and 20-1A. The backfilling and grading schedule is shown on Exhibit 19-1 and 19-1A. Reclamation costs are discussed under Tab 25, Bonding. PR04 5b Revised 09!04