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GBEA Wagner Pit#M2023038,Owner&Operator:Twin Buttes Land Co LLC 04/1012024,Page 43 of 65 <br /> Reclamation Plan, Exhibit D <br /> Part 1 <br /> Timing of Overburden Replacement& Depth (a) <br /> The use of overburden to cover rock and other substrates may become problematic and <br /> the timing uncertain, given the intermittent nature of the pit operation, lack of <br /> overburden in some areas, plus the potential to use the overburden off site. If the <br /> operator determines that no more mining will be done in an area and sufficient material <br /> is available to fill and contour, a reasonable time frame is a year to begin the <br /> reclamation process. Reclamation will proceed incrementally, or in small areas of the <br /> pit, an acre or much less will be the norm. <br /> Sitting over the high wall there are areas of exposed bedrock and very thin soil. Those <br /> areas may never be covered with overburden and topped with soil. This outcome is due <br /> to the legacy operation of the pit. See Appendix D for photos of the poor soils and bed <br /> rock. <br /> If sufficient material is available, a minimal target depth of 18 inches of overburden <br /> should be placed on top of the underlying waste materials. <br /> Slopes and Gradients (b) <br /> The pit can be divided into four areas according to the general slope and exposure. Map <br /> D1 shows the polygons (following page). They are listed with the current and average <br /> final gradient: <br /> 1. Flats that surround the hill -"flat" and they will remain so (polygons A,C,and D). <br /> 2. High Wall, south facing (red outline polygon) - currently slopes are 0.63 (run)/1 <br /> (rise) maximum and average 1.23 (run)/1 (rise). The High Wall will remain at the <br /> current gradient and not be reclaimed. <br /> 3. The slope and benches above the High Wall (polygon B-2) - currently averages 6 <br /> (run)/1 (rise). The reclaim gradient will be no greater than 3 (run)/1 (rise) on <br /> average. Some areas are exposed bed rock and may not be reclaimed. <br /> 4. North Slope of the hill (polygon B-1) - currently averages 5.4 (run)/1 (rise). In <br /> areas to be reclaimed the gradient will be no greater than 3 (run)/1 (rise) on <br /> average. <br /> Map D1 shows a red outlined polygon covering 1.21 acres of High Wall, the steepest <br /> area. It is again noted that the High Wall will remain well into the future and remain at <br /> the current gradient. No attempt to contour, reclaim, or establish vegetation at the <br /> High Wall will be made. <br /> The run/rise ratios stated are averages other than the high wall. Final grades will have <br /> areas that are steeper and in keeping with the small draws and drainages that currently <br /> exist. <br /> In summary, most reclaimed areas will be, at maximum, 3 (run)/1 (rise). Many areas will <br /> be less, with areas that are slightly steeper to accommodate drainage and waterways. <br /> D3 <br />