2023-09-13_PERMIT FILE - M2023033A (6)

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The typical pit pump location can be seen on Map C-2. 7.2. Groundwater — Reclamation Permanent water storage reservoirs will be left behind within each pod, as can be seen on Map F-1. There will be no groundwater consumptive use in reclamation. 7.3. Groundwater — Slurry Wall Impact The installation of several slurry walls within the alluvial aquifer of the South Platte River creates two main potential impacts to the aquifer: the creation of local groundwater shadows or mounding that damage neighboring structures or property and the potential exacerbation of regional groundwater impacts. For these reasons, the applicant has had a groundwater model developed by GSI. The groundwater model looks at the potential impacts of the slurry wall installation on neighboring property and structures, particularly the Xcel supply wells. 7.3.1. Xcel Supply Wells A set of five groundwater wells run along the west side of the mining pod 1 (Map C-1). Xcel energy pumps from these wells to supply their operations near Keenesburg, CO. The wells feed a pump house on the northwest corner of the property, from there the water is pumped east to Keenesburg. The wells are located both upstream and downstream of a proposed slurry wall. GSI analyzed the impact of the slurry wall on the Xcel wells to determine if the wall would prevent the wells from producing as Xcel required. The GSI report is in Appendix G-3. Monitoring of the groundwater level along the South Platte River and the slurry wall will take place as outlined in the groundwater monitoring plan in Appendix G-2. 8. Water Related Permits The operator is applying for all necessary permits that have not already been acquired for water handling at the Ewing Gravel Pit. This includes a discharge permit with the Colorado Department of Public Health and Environment and a gravel well permit for initial dewatering of each pod with the Colorado Division of Water Resources. 9. Water Consumption and Source Water for dust control will be the primary consumptive use at the Ewing Gravel Pit site. Water will also be used for aggregate washing, dust control, and concrete/asphalt production. Water will be purchased from the local water conservancy district during operations. No ongoing water consumptive use exists in reclamation, since the water storage pods are lined. This water will be sourced from a freshwater pond in the processing area. This pond will be covered by a gravel well permit. Table G-7 summarizes the estimated water consumption for the operation throughout the year. Ewing Gravel Pit August 2023 G-8 Lewicki&Associates