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and possibly before mining any of the new expansion area, the McCann Ditch will be <br />relocated as shown on the Mining and Reclamation Plan Maps (Figures D 1 and F 1). <br />Dewatering trench excavation will be performed with an excavator down to the <br />top of or up to several feet into the underlying claystone bedrock. Trench sidewalls in <br />bedrock will be excavated approximately vertically. The trenches will be constructed to <br />develop flow to discharge locations and minimize evaporative losses. Ground water will <br />drain from the.alluvial sand and gravel, collect in the trenches, and be discharged to the <br />South Platte River. <br />Some ground water dewatering discharge will be performed under two existing <br />NPDES discharge permits at established locations along the South Platte River already in <br />use for the existing permitted area. One of the NPDES permits will be amended to allow <br />discharge to a new point along the relocated McCann Ditch within the expansion area to <br />allow for mitigation of temporary dewatering impacts to ditch flows. Dewatering trench <br />flow will not be needed to provide the source water for processing which will be done at <br />the existing Bromley Lakes Pit plant. A new well permit for dry mining will be obtained <br />for the new expansion area from the Office of the State Engineer. Additional information <br />related to dry mining via dewatering trenches and future slurry wall isolation of the <br />mined area planned to ultimately become sealed water storage is included in Exhibits E, <br />F and G (Reclamation and Water exhibits). <br />Mining excavation will be performed by loaders and or scrapers at temporary <br />excavation slopes of 1:1 (H:V) or steeper. As mining progresses from the south towards <br />the north, field conveyors, hoppers, and transfer points will be utilized to provide in-pit <br />loading locations and conveyance to the existing gravel plant area. Other possible <br />equipment will include dozers, track excavators, a water truck(s), and miscellaneous <br />support vehicles. All fuel and lubricant storage will be at the existing facilities at the <br />plant area and only fuel transfer via fuel trucks will occur in the new mining area. <br />No fresh or wash water ponds will be established within the proposed expansion <br />area at the site. The existing plant at the Bromley Lakes Pit will continue to collect fresh <br />water and discharge wash water to in-pit sedimentation ponds, as is currently being done. <br />No off-site hauling is proposed from the new expansion area and all sales traffic will <br />continue to be from the existing sales office driveway at 14585 Brighton Road. Total <br />25