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thick. The bedrock below the alluvial deposit is shale at approximately 25-30 feet below the <br /> surface. <br /> The aquifer present at the site is the alluvial aquifer of the Colorado River. This aquifer is <br /> approximately four feet below the surface. The alluvial aquifer is unconfined and is part of the <br /> greater Colorado River Basin. The aquifer is approximately 25 feet thick at the site. The <br /> hydraulic conductivity of the aquifer, based on pump tests in Rifle, CO, range from 55 to 275 <br /> feet/day'. The aquifer is recharged in various ponds and canals throughout the basin. <br /> Underlying the Colorado River aquifer is the Piceance bedrock aquifer which will not be <br /> interacted with as it is between 100-500 feet below the surface. <br /> There is not enough groundwater level data near the site to develop a potentiometric surface. <br /> However, the location and flow of the Colorado River, as well as the topography of the site <br /> indicate that groundwater is moving west, or possibly northwest. There is conflicting data from <br /> local groundwater wells that suggests water is flowing to the southwest. Groundwater direction <br /> will be confirmed during baseline water quantity testing. After which, a potentiometric model will <br /> be developed. <br /> A baseline map showing proposed wells and existing hydrologic conditions of the site is <br /> attached in Appendix 1. <br /> ' Groundwater Compliance Action Plan for the New Rifle, Colorado, Processing Site, U.S. Department of <br /> Energy, 2016. <br /> North Hangs Mine GW Monitoring <br /> Plan 3 il Lewicki& Associates <br /> December 2024 <br />