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(b) Earthmoving; <br /> Topsoil and overburden will be stripped with conventional heavy earthmoving equipment and <br /> stockpiled in segregated piles at the edge of the active mine phase where not encumbered by <br /> the Floodway. The equipment used to excavate onsite materials may include, but is not <br /> limited to excavators, front-end loaders, and/or bulldozers. Conveyor belts or haul trucks will <br /> be utilized to transport the raw material from the active mine phase to the processing area. All <br /> phases will be mined at a 0.5:1 slope or flatter. <br /> (c) All water diversions and impoundments;and <br /> The perimeter of the mined areas will be dewatered by digging dewatering trenches extending <br /> deeper than the mining interval eventually reaching into the bedrock at the bottom of the mine. <br /> The water will be pumped into a settling pond and discharged in accordance with a CDPHE <br /> discharge permit. Wash water for the processing area will be recycled through a series of <br /> ponds within the processing area. The water required to operate the facility will be supplied <br /> under the provisions of a substitute water supply plan (SWSP). <br /> (d) The size of area(s) to be worked at any one time. <br /> The mine phases will be mined in stages that range from approximately 2 to 131 acres. The <br /> Operator may mine multiple stages concurrently in order to obtain a range of material for <br /> production. In addition to mining, the Operator, will begin reclaiming slopes as mining is <br /> finished in each stage. Since multiple stages will be being worked at any one time, the <br /> approximate combined size of the areas being worked at any one time may range from 25 <br /> acres to 131 acres and will depend on market conditions. <br /> (e) An approximate timetable to describe the mining operation. The timetable is for <br /> the purpose of establishing the relationship between mining and reclamation <br /> during the different phases of a mining operation. <br /> The Operator anticipates that mining will commence as soon as all permits are in <br /> place. The Operator anticipates extracting approximately 500,000 tons of aggregate <br /> per year however, production rate may vary based on market demands. <br /> Estimated Timetable for Mining and Reclamation' <br /> Phase 1: Mining will begin with the fresh water source and silt storage area in the first year. <br /> Stripping of the plant area will also occur. Mining may take up to a year. This area will take <br /> approximately a year to reclaim and reclamation of the phase 1 area will happen at the end of <br /> the mine's life. <br /> Phase 2:This phase will take approximately 11 years to mine and 2 years to reclaim. <br /> Phase 3: This phase will take approximately 4 years to mine and 1 year to reclaim. <br /> Final reclamation will occur after mining is complete in a given Phase. When possible, <br /> concurrent reclamation practices will be used to minimize site disturbance and to limit material <br /> handling to the extent deemed practical by the operator. Please refer to the Mining Plan Map <br /> in Exhibit C for the location of mine phases and areas where processing and other onsite <br /> Martin Marietta Materials—Thunderbird Sand and Gravel—MLRB 112 Permit Application <br /> Exhibit D-3 <br />