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W- - a <br /> Transit Mix Concrete Co. <br /> benches will be 20 feet wide so that the overall slope is 1:1(H:V) as illustrated in Figure C-10. <br /> These parameters are based on geotechnical investigations and are similar for other mines in the <br /> area. A copy of the geotechnical investigation conducted for project area is attached as Exhibit <br /> 6.5. The Quarry was designed with a factor of safety of at least 1.3 for all benches, highwalls, and <br /> slopes to exceed national standards. <br /> Most of the granite and diabase resource will need to be drilled and blasted for economic <br /> production. All blasting will be conducted by trained, experienced, and competent persons who <br /> understand the hazards involved in a blasting operation. Blasting will be scheduled in such a way <br /> that the impact will be minimized to the nearby areas. Explosives will be used to fracture and <br /> fragment granite or diabase to facilitate material handling. Blast holes will be drilled using a <br /> hammer drill, with the size and blasting pattern designed to assure a safe working buffer from <br /> other Quarry activities and have no detrimental impact beyond the permit boundary. The weight <br /> of explosives for each drill hole will be based on the desired size fraction of granite or diabase <br /> necessary to haul and feed into the processing system at the plant site. Explosives (ammonium <br /> nitrate/fuel oil -ANFO), and primers/boosters will be stored offsite and provided by the blasting <br /> contractor.An ANFO/Emulsion blend is expected to provide the optimal blast fragmentation. <br /> Once blasted, granite and diabase material will be removed with loaders and placed in trucks to <br /> be hauled to the plant area where it will be crushed and screened to appropriate sizes. <br /> Contemporaneous reclamation will occur throughout mining as feasible and as areas are <br /> available. During mining, overburden and fines will be stored in stockpile F1 or used to reclaim <br /> completed areas. After mining establishes the eastern and western pit floors, overburden and <br /> fines will be direct hauled and placed as backfill in backfill areas F2 and F3. The overburden and <br /> fines will first be placed in the F2 area, as shown on Figure C-6. As sufficient pit floor area <br /> becomes available, the overburden and fines will be placed on the pit floor to augment reclamation <br /> efforts. During reclamation, fines and overburden will be used as a subgrade material placed <br /> beneath the topsoil to aid in revegetation. Each phase of mining and reclamation activities are <br /> discussed in detail below. <br /> The conceptual locations of in-pit access and haul roads are shown on the figures; however, the <br /> haul road locations will be based on field observations during the execution of the Plan. Should <br /> these roads need to be moved, a Technical Revision will be submitted to incorporate new facilities <br /> showing the location and size(width and length) of each road into the mining area. This Technical <br /> Revision will include a revised facilities map. <br /> The acreage, overburden volumes and saleable tons for each phase can be found in Table D-2. <br /> Hitch Rack Ranch Quarry Permit Application <br /> March 20, 2018 D-7 <br />