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unchanged and may be left as is in Exhibit 13. The specific details of the reduced bond <br />calculation and bond adjustment can be summarized by the following points: <br />Section 9 - In the previous estimate, the Section 9 disturbance was a progressive single <br />seam operation located on the west end of the east Pit. This project was never pursued <br />during the previous 5-year Permit term. This change reduced the regrade volume by <br />approximately 1,300, 000 cubic yards. <br />Section 15 -The bond plan for the previous 5-year Permit term designated the section <br />16 pit initial shovel box cut for closure. 113,256 cubic yards of material was to be <br />handled for end wall excavation, grading and channel cutting. Since the Section 16 pit <br />has advanced well beyond this box cut and the box cut is now backfilled with spoil, <br />excavation is no longer required in the current plan. <br />Section 16 -The bond plan for the previous 5-year Permit term designated two open pits <br />for closure, while the current projected plan calls for a single open pit for closure. This <br />change alone has reduced the regrade volume by 3,445,375 cubic yards. <br />Technical Revision No. 31. TR- 31 (approved by the Division on April 24, 1995) <br />provided an East Pit mine plan modification and additional bond calculation add-on for <br />an additional 222,640 cubic yards of topsoil distribution and reclamation costs. The <br />current projected plan includes this affected area and, thus, eliminates the need for this <br />bond add-on. <br />East and West Pit, Drainage Cuts -The previous estimate contained approximately <br />3,600,000 cubic yards of material in the end walls of both multiple seam pits to be <br />moved for drainage excavation. The current projected plan calls for drainage cut <br />volumes of approximately 300,000 cubic yards exclusively in the West Pit. This has <br />reduced the drainage cut volume by approximately 3,500,000 cubic yards. <br />We have included with TR-43 revised Bond Maps/Drawings as follows: <br />Drwg 34 -Bond Calculation Map -Worst Case Topography. North Area <br />Drwg 35 -Bond Calculation Map -Worst Case Topography. South Area <br />Drwg 36 -Bond Calculation Map -Regraded Topography South. <br />Drwg 38 -Bond Calculation Map -Facilities Removal and Regrade <br />Drwg 39 -Bond Calculations, Cross Sections <br />Drwg 40 -Bond Calculations, Cross Sections -Section 9 and 15 Disturbance <br />The following drawings have been replaced by more efficiently combining cross sections <br />onto Drawing 39 and 40 and may be discarded. The respective map pocket will remain empty <br />until needed for future Permit information. <br />Drwg 41 -Bond Calculation Cross Section -Section 10, Disturbance A. <br />Dnvg 42 -Bond Calculation Cross Section -Section 10, Disturbance B. <br />Drwg 43 -Bond Calculation Cross Section -Section 16 Disturbance. <br />2 <br />