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-59- A number of high-resolution, closely-spaced subsidence monuments have been installed in sites selected throughout the existing permit area. Monitoring stations No. 201 through No. 224 are installed above projected fault traces in an attempt to discern the effects of differential subsidence between alternating fault blocks, Stations No. 42 through No. 51 are located in areas of thick overburden. Stations No. 28 through 41, in contrast, have been installed above overburden thicknesses considered typical throughout the permit area. The high-resolution subsidence data will be used to evaluate and further define the projected angle of draw. Data collected from these monument grids wilt allow verification, or support redesign, of the subsidence control plans proposed by CWI for implementation in the future. The subsidence portion of the application is in compliance with the Regulations. XXII. SPECIAL CATEGORIES OF MINING OTNER THAN AVF AND PRIME FARMLAND This section applies to the following categories of mining: Experimental Practices Mining Mountaintop Removal Mining Steep Slope Mining Concurrent Surface and Underground Mining Auger Mining In-Situ Processing Variances from Approximate Original Contour Orchard Valley mine has obtained a variance from the requirement for restoration of affected lands to their approximate original contour in accordance with Rules 2.06.5 and 4.27. The variance was granted under the 1981 permit and is hereby reissued. The variance applies to the mine benches only and was granted because it was demonstrated that backfilling the benches to A.O.C. on such a steep slope would not achieve the required slope stability safety factor of 1.3 (see Yolumes 6 and 6A, Stability Analysis, for a complete discussion). The coal loadout facility is located within the proposed permit area. There will be no in situ coal processing operations at the site. Since this is an underground mine, provisions pertaining to mountaintop removal, steep slope mining and angering operations are not applicable. There are no surface mining activities adjacent to the proposed permit area. The proposed operation is in compliance.