2025-10-23_PERMIT FILE - M2025049

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RIVERCITY Exhibit G Water Plan The proposed mining operation is expected to directly interact with groundwater as excavation progresses below the seasonal high groundwater table. Water will periodically accumulate in the excavation pit and must be pumped to maintain safe and efficient working conditions. The Operator has submitted coverage under the Colorado Discharge Permit System (CDPS) General Permit COG500000 for Discharges from Sand and Gravel Mining and Processing (and Other Nonmetallic Minerals Except Fuel). All pit dewatering discharges will be managed in strict compliance with this permit, which establishes monitoring requirements and reporting obligations. A network of monitoring wells has been installed along the project boundary to provide baseline and ongoing data on groundwater levels and water quality (see Exhibit G—Monitoring Well Locations).These wells function as compliance points to verify that mining and dewatering activities do not adversely affect groundwater resources. Surface water resources in the vicinity of the project include the Colorado River, immediately south of the site, and the No Name Drain, which traverses the project boundary and will remain in its natural drainage configuration. The site is underlain by the Unconsolidated Alluvial Aquifer associated with the Colorado River system. While localized dewatering of the pit will occur during active mining, no measurable long-term drawdown or alteration of aquifer conditions is anticipated. Disturbed areas will be graded to direct runoff as well as ground water into the pit or reclamation pond, thereby preventing uncontrolled discharge from the site. Perimeter berms and other erosion controls will remain in place to ensure sediment is contained within the mining area. Dust suppression will be achieved through the application of water to haul roads and stockpiles. Petroleum products and similar materials will be stored with adequate secondary containment to mitigate the risk of releases. All water handling, pumping, and discharge activities will be conducted under the conditions of the CDPS COG500000 permit. In addition to dust suppression and reclamation watering, water will be required for aggregate processing, specifically for crushing and screening operations. This water use is necessary to control dust emissions at the crusher and conveyor transfer points, as well as to wash material where needed to meet product specifications.These operational water demands will be met primarily from on-site sources (pit inflows and stormwater capture)with supplemental volumes obtained from permitted off-site suppliers if necessary.