2021-09-09_REVISION - M2004044 (10)

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EXHIBIT G -WATER INFORMATION This information provided in this Exhibit is intended to satisfy the requirements outlined in Section 6.4.7 of the Colorado Mined Land Reclamation Board 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 as the slurry wall and underdrain will be constructed ahead of mining. The underdrain is designed to preserve the hydrologic balance at the site as discussed later in this exhibit. (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 o described in: George VanSlyke, et. al. 1988, Geologic Structure, Sand stone/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. • the South Platte River Alluvial Aquifer • described in: 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 Areas will be installed prior to mining. All dewatering water will be monitored under the discharge permit (see below). Consequently, contaminants of concern inside the mine will not impact the surrounding Aggregate Industries-Tucson South Amendment-MLRB 112 Permit Application Exhibit G-1