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RIVER ITY <br /> f. _ 7 r: <br /> (a) Methods of Mining and Surface Disturbance <br /> The proposed operation will be a surface sand and gravel pit mined with conventional <br /> equipment, including loaders, excavators, haul trucks, and crushers. Disturbance will include <br /> excavation areas, topsoil berms, overburden storage, haul roads, and stockpile pads, all as <br /> shown on Exhibit C. <br /> (b/c) Earthmoving,Water Diversions,and Impoundments <br /> Earthmoving will consist of stripping soil, overburden removal, excavation of sand and gravel, <br /> and placement of berms and stockpiles.The final landform will include an approximately 11.5- <br /> acre pond located in the center of the property, with side slopes no steeper than 3:1. No <br /> diversions of the Colorado River are proposed. Site drainage will be directed to the pond or will <br /> follow existing drainage patterns in undisturbed areas. <br /> (d)Area to be Worked at Any One Time <br /> At any given time, no more than 5 to 10 acres will be actively disturbed by excavation, <br /> stockpiles, or processing. <br /> (e)Timetable for Mining and Reclamation <br /> Mining will commence in 2025,following permit approval, and will continue for approximately <br /> ten years of active extraction. An additional two years will be required for depletion of <br /> stockpiles and final reclamation.The operation will be continuous and not intermittent. Mining <br /> will progress sequentially from the south (floodway area) northward toward C Y2 Road. <br /> Reclamation will be carried out progressively as areas become available and completed no later <br /> than twelve years from the start of operations. <br /> • Years 1-3: Stripping of soil, initial excavation in the southern floodway, establishment of <br /> berms and stockpiles north of the floodway. <br /> • Years 4-7: Ongoing excavation progressing northward, continued processing and <br /> stockpiling, progressive reclamation of completed areas. <br /> • Years 8-10: Final excavation phases near haul road, preparation for final grading and <br /> pond development. <br /> • Years 11-12: Removal of stockpiled materials,grading,topsoil redistribution, seeding, <br /> trail construction, and final reclamation. <br /> (f) Nature and Thickness of Deposit and Overburden <br /> The sand and gravel deposit extends across the permit area and will be mined to the <br /> groundwater table.The top six inches of topsoil will be salvaged as plant growth medium. <br /> Overburden will be stripped and stockpiled separately from topsoil.The deposit overlies native <br /> alluvial sands and gravels adjacent to the Colorado River. <br />