2018-11-21_REVISION - M2004044 (21)

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(10)All mined material to be disposed of within the affected area will be handled in such a manner to prevent any unauthorized release of pollutants to the surface drainage system. (11) No unauthorized release of pollutants to groundwater shall occur from any materials mined, handled or disposed of within the permit area. More specific information regarding how Al will comply with the performance standards is outlined below. Final Proposed Land Use The current land use for the Tucson South Resource property is a combination of partially reclaimed mining area, dryland agriculture, upland meadow and a City of Aurora water facility. The City of Aurora water facility(located outside the Affected Lands, west of the Brighton Ditch)will be removed from the Permit Boundary at a future date and continue to operate. The proposed final land use for the remainder of the property is lined municipal water storage for the West cell and the majority of the East cell, upland meadow on the northern portion of the East cell and an upland meadow for South cell. Surrounding land uses include:Water storage to the north, rural residential and agriculture to the south,Town of Brighton wildlife conservation area and the South Platte River to the east and water storage and suburban residential to the west. The lined storage and upland meadows are compatible with existing and future adjacent land uses. This property lies within the City of Brighton Urban Growth area and is designated as natural resource conservation and flood plain on the 2016 Future Land Use Map. General Overview of the Reclamation Plan Types of Reclamation acres Reclamation of the proposed permit area will contain two land forms; uplands and lined,open water reservoirs. Cottonwoods and shrubs will be planted along the South Platte River on the eastern side of the east cell. Timing and installation of the plantings will be coordinated with the Urban Drainage and Flood Control District. It is anticipated that these plantings will be installed prior to mining in the East cell and will be established as part of the concurrent reclamation of the site. The primary reclamation process will be backfilling the slopes of the mined-out areas to be reclaimed as reservoirs and backfill of the South cell and the partially reclaimed area on the northern end of the East cell to create an upland meadow. Overburden,and non-marketable materials from the site will be used as backfill. As mined out cells are backfilled, rough grading will establish the slopes and elevations necessary to facilitate the appropriate land form for that specific area of the site. In upland areas backfill materials will be placed to an elevation near or below the pre-mining surface elevation. For areas where reservoirs are to be located, backfill will be used to create pond side slopes. Pond depth may extend all the way to bedrock and side slopes will be 3H:1 V or flatter. Except for pond slopes below normal average highwater surface elevation, all areas disturbed by mining activities will be prepared with topsoil to a minimum of 6 to 12 inches and revegetated during reclamation. Revegetation will generate a blend of upland grass species. Given suitable precipitation, seeding should produce good vegetation cover over much of the reclaimed site. Roads not necessary for future access and other disturbed areas will be reclaimed with topsoil and overburden replacement and vegetative cover to stabilize the areas and minimize erosion. Reclamation Measures/Materials Handlinq All available topsoil and overburden material will be used for backfilling and reclamation. Earth moving equipment may include, but is not limited to dozers, loaders,scrapers,and excavators. Additional farm equipment for grading and seeding may be used for revegetation activities. Aggregate Industries Tucson South Resource Permit#M-2004-044 112 Permit Amendment Page E-2