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setback from any existing oil/gas facility will be maintained until that time. See Exhibit C, Mining <br /> Plan Map, and the Slope Stability Report for the mining limit configuration and information on <br /> setbacks and their locations. <br /> Products <br /> Sand and gravel will be the primary product produced from the DPG Mining site. The principal <br /> intended use for the sand and gravel is for road base and construction aggregates. <br /> Subsurface drilling and testing have verified that the DPG Mining site property contains a <br /> significant commercial deposit of sand and gravel. The depth of interbedded sandy clays and <br /> clayey to silty sands at the surface range from 3 to 12 feet. The thickness of the aggregate <br /> material ranges from 67 to 102 feet where bedrock contact occurs. <br /> Mininq Methods <br /> The deposit will be dry mined and a slurry wall will be constructed around the perimeter of the <br /> mining area for Phase 1. Phase 2, 3, 4, and 5 will not be opened until the slurry wall is <br /> constructed around each phase prior to mining each phase. Design specifications for the slurry <br /> wall and quality control procedures used during construction will ensure that the reclaimed <br /> reservoir meets State Engineer's Office (SEO) performance standards. Dewatering trenches will <br /> be excavated around the perimeter of each mining area in Phases 1 — 5 prior to mining <br /> operations commencing. The depth of the ditches will vary as the mining progresses deeper into <br /> the alluvium in order to maintain the groundwater level below the active mining bottom surface, <br /> and therefore minimize the exposed groundwater surface area. The dewatering ditches will flow <br /> to a collection pond, from which the water will be pumped into a ditch, which traverses the <br /> mining phases and eventually discharged into the Cache La Poudre River. <br /> The equipment and facilities may include, but are not limited to the following: <br /> Processing Equipment <br /> Screens, crusher, conveyors, stackers, and other miscellaneous processing equipment. <br /> Earth Movinq Equipment <br /> Dozers, loaders, scrapers, excavators, and compactors will be used for mining and earth <br /> moving operations. <br /> Miscellaneous Equipment <br /> Dewatering pumps, electrical trailer, generator trailer, small portable generators and <br /> watering trucks will be used as needed. <br /> As mining progresses, topsoil and overburden will be stripped to expose the aggregate product <br /> below. All soil and overburden material will be used on-site for reclamation; so long-term <br /> stockpiling of these materials is not anticipated. Overburden stockpiles will be located within the <br /> proposed mining area. The stockpiles will be placed parallel to the floodplain to mitigate impacts <br /> to the floodplain. <br /> Mining of the aggregate will progress down to the underlying bedrock. Since reclamation will <br /> occur concurrently with mining, it is not anticipated that overburden material will be stockpiled <br /> long-term prior to use in production of road base and potentially backfilling of pit areas that are <br /> not lined with a slurry wall. During mining the mining face will have a 3H:1 V slope to bedrock or <br /> J&T Consulting,Inc. J-2 Contracting Company <br /> u' DPG Mining Site <br /> DRMS 112 Permit Application <br />