2019-07-09_REVISION - M2004044 (30)

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EXHIBIT G Water Information The information in this Section is intended to satisfy the requirements outlined in Section 6.4.7 of the Colorado Mined Land Reclamation Board's Construction Material Rules and Regulations. (1) If the operation is not expected to directly affect surface or groundwater systems, a statement of that expectation shall be submitted. This site is directly adjacent to the Brantner Ditch, Brighton Ditch and the South Platte River. The Brantner Ditch,the Brighton Ditch and South Platte River will not be disturbed because of the mining and reclamation activities on the site. (2)If the operation is expected to directly affect surface or groundwater systems, the Operator/Applicant shall.- (a)Locate on the map(in Exhibit C)tributary water courses, wells, springs, stock water ponds, reservoirs, and ditches on the affected land and on adjacent lands where such structures may be affected by the proposed mining operations. Please see Exhibit C Pre-Mining Maps for the location of all tributary water courses, wells,springs,stock water ponds, reservoirs, and ditches on the affected land and on adjacent lands where such structures may be affected by the proposed mining operations (b)Identify all known aquifers The Tucson site is underlain by two relevant aquifers:the Upper Arapahoe Aquifer(George VanSlyke, et. al. 1988, Geologic Structure, Sandstone/Siltstone Isolith, and Location of Non-Tributary Ground Water for the Arapahoe Aquifer, Denver Basin, Colorado. Denver Basin Atlas No.3, DBA-3. Colorado Division of Water Resources, Office of the State Engineer.), and the South Platte River Alluvial Aquifer. The South Platte River Alluvial Aquifer is described in the Tucson South Resource Ground Water Modeling Study on the Hydrologic Effects of Mining at Page 3, (Tetra Tech RMC 2004) (c) Submit a brief statement or plan showing how water from de-watering operations or from runoff from disturbed areas,piled material and operating surfaces will be managed to protect against pollution of either surface or groundwater(and, where applicable, control pollution in a manner that is consistent with water quality discharge permits), both during and after the operation. The slurry wall for the West and East cells of State will be installed at the beginning of operations at the site. Consequently, contaminants of concern inside the mine cells will not impact the surrounding alluvial aquifer. The interbedded, siltstone and claystone of the Arapahoe Aquifer and associated very low vertical hydraulic conductivity isolates the Arapahoe aquifer from mine operations and potential releases. Monitoring wells have been installed around the West, East and South Areas so in the unlikely event of a release, possible impacts to ground water can be monitored. Water from the initial dewatering operation and runoff from disturbed areas, piled material and operating surfaces will be diverted to the settling ponds for detention and cleansing. The South Mine Area(Phase 1)will be dewatered and will not have a slurry wall.; dewatering trenches will be located around the perimeter of all mining areas. Settling occurs in the trenches, and if necessary,settling ponds will be constructed at a point prior to discharge. Discharges will be directed to the South Platte River, at various points as designated within a State of Colorado, Division of Water Resources, Colorado Discharge Permit System(CDPS) permit. Monitoring Aggregate Industries Tucson South Resource Permit#M-2004-044112 Permit Amendment Page G-1