2010-02-11_REVISION - M1996049 (8)

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STORMWATER MANAGEML i PLAN 2/20/09 Maryland Creek Ranch 2. DESCRIPTION OF INDUSTRIAL ACTIVITIES AT MINE SITE There is a sand and gravel mining and processing operation at this site. Ready mix dry batch concrete and hot mix asphalt plants are also located within the site boundaries. An office and scale exist on the north side of the site. The mining plan and reclamation plan have been approved both by the Colorado Division of Reclamation, Mining, and Safety (DRMS) and the Summit County Board of County Commissioners. STRIPPING Topsoil and overburden are removed in advance of mining, and the materials are hauled from the removal site and/or stockpiled. Overburden and topsoil stockpiles may be in the form of berms that are routinely revegetated to stabilize them. STOCKPILING Topsoil and overburden will be stockpiled in the form of earthen berms as noted on the site map. All topsoil and overburden stockpiles will be revegetated. Raw materials are stockpiled for future processing and sales. Processed-sand and gravel products are stockpiled for sales. EXCAVATION The moist or dry raw material (unprocessed sand and gravel) is excavated by draglines, front end loaders, and/or backhoes. The material may either be stockpiled for future processing or transported directly to the processing plant by conveyors or haul trucks. The excavation will maintain an appropriate set-back distance away from the ditches, wells, and pipelines, although some conveyance structures may be relocated to facilitate mining operations. PROCESSING -CRUSHING, SCREENING, and WASHING Processing consists of different stages, depending on the desired product(s). Most material is fed into a crusher, then sent through a screening process, where it is separated into different sizes. Crushing and screening may be repeated depending on the end product. Most material is then washed to separate the fines from the desired product. The product wash water will be directed through settling ponds, which allows the fines to settle out, and the water to be recycled and continuously reused. PRODUCTION - CONCRETE and ASPHALT A ready mix dry batch concrete plant and a hot mix asphalt plant are both located with the processing area. These plants are operated on an as needed basis, but typically the ready mix dry batch concrete plant operates twelve (12) months per year. The hot mix asphalt plant will typically operate from April through November. RECLAMATION When the mining operation has been completed, the pit will be reclaimed according to the approved DRMS mining and reclamation permit. 2