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The Rocky Mountain Energy Center listed wells are the Xcel wells for powerplant water. They <br /> are listed separately in Table G-5. The landowner has recently installed piezometers onsite for <br /> groundwater level monitoring. These are listed in Table G-6. The piezometers will be used to <br /> track groundwater changes before and during mining. They will remain following reclamation for <br /> the benefit of the landowner. <br /> Table G-5. Xcel Supply Wells Within 600' of Permit Area <br /> Total Distance from <br /> Depth nearest mining <br /> Applicant/Well ID Permit ID (feet) Purpose area (ft) <br /> ROCKY MOUNTAIN ENERGY 58545-F 50 Industrial 375 <br /> CENTER LLC <br /> ROCKY MOUNTAIN ENERGY 58543-F 52 Industrial 88 <br /> CENTER LLC <br /> ROCKY MOUNTAIN ENERGY 58540-F 50 Industrial 472 <br /> CENTER LLC <br /> ROCKY MOUNTAIN ENERGY 58541-F 54 Industrial 319 <br /> CENTER LLC <br /> ROCKY MOUNTAIN ENERGY 58544-F 46 Industrial 65 <br /> CENTER LLC <br /> ROCKY MOUNTAIN ENERGY 58542-F 58 Industrial 52 <br /> CENTER LLC <br /> Table G-6. Piezometers <br /> Total Distance from <br /> Depth nearest mining <br /> Applicant/Well ID (feet) Purpose area (ft) <br /> Piez-1 50 Industrial 208 <br /> Piez-2 50 Industrial 50 <br /> Piez-3 50 Industrial 97 <br /> Piez-4 50 Industrial 450 <br /> Groundwater quality data was gathered in advance of mining. This data and discussion of it can <br /> be seen in the Groundwater Monitoring Plan in Appendix G-2. <br /> 7.1 . Groundwater — Mining <br /> Prior to mining of a pod a slurry wall will be installed around the perimeter of the pod to prevent <br /> groundwater flow into the mining area. Following slurry wall installation, the operator will mine <br /> out the pod by dewatering it via the approved CDPHE discharge point. Pumping to conduct this <br /> dewatering will take place during the initial mining of each pod and then pumping will cease. <br /> Stormwater runoff that is collected in an active pod may be pumped out to protect local water <br /> rights, once sediment has settled. For this reason, the CDPHE discharge point will be <br /> maintained over the life of the mine. The pump will be located at least two feet below the active <br /> mining floor at the lowest point of the pit. It will be surrounded by a gravel filter. This <br /> configuration minimizes the risk sediment being pumped out of the pit. <br /> Ewing Gravel Pit <br /> August 2023 G-7 Lewicki 81 Associates <br />