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iv) For permanent stock tank impoundments (as well as sediment ponds proposed for permanent retention) demonstration of compliance with the requirements of 4.05.9(73)(a) through (f) wilt need to be provided. 2.05.4(21(bl Reclamation Cost Estimate 20. Tab 25 of the approved permit application package addresses reclamation cost estimate considerations. No proposed amendments to Tab 25 were included in the PR-4 application, but it is clear that the information will need to be updated to incorporate the mining and reclamation plan changes associated with PR-4. Of particular note are worst case disturbance assumptions, which would be outdated upon approval of PR-4. Currently, Tab 25 narrative projects that worst case disturbance would occur in 2003. Under the PR-4 mine plan revisions, the IIW-South Wadge Pit 2 miles in length would remain open through 2005 to accommodate highwall mining, coincident with the existence of dragline pits in two separate Wolf Creek/Sage Creek Areas. As such, it would appear that 2005 would become the worst case year for purposes of the reclamation cost estimate. Please amend Tab 25 as appropriate to reflect worst case disturbance assumptions as altered by the PR-4 mine plan revisions. Please consider and address the concerns and requests pertaining to worst case backfilling and grading scenarios in Items 27(d), (e), and (f), below, in preparing the Tab 25 amendments. 2.05.4(2)(c) Backfilling and Grading 21. We have a number of concerns with the backfilling and grading schedule as described on amended pages 5, 5a, Sb of Tab 19, and amended Exhibit 19-1A. a) There is an inconsistency regarding backfilling schedule for the lower "A" Pit 180 day variance areas between amended Exhibit 19-1A and text on amended page 5a. Specifically, the text indicates that the lower "A" Pit variance areas are to be backfilled and graded by the end of 2003, whereas on Exhibit 19-1A, a portion of the "A" Pit immediately adjacent to the "B" Pit area is labeled 2004. The exhibit appears to be in error, and should be amended to specify completion of backfilling and grading in 2003. b) The Exhibit 19-1A map legend appears to be misleading in one instance, and needs to be clarified. The concern is with the non-variance area along the southern boundary of the lower "A" Pit area. The legend could be mis-interpreted as indicating that backfilling might not be required until 2005. However, because the 180 day variance did not apply to the subject area, backfilling and grading is to be completed in 2003. Please add a notation to the map to specify completion of backfilling and grading in 2003.