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6. Known aquifers <br /> The only known aquifer in the area is the shallow alluvial aquifer of the Colorado River. Depth <br /> to water table in the permit area varies depending on location and time of year but averages <br /> roughly seven feet below ground surface. According to the U.S. Geological Survey's Ground <br /> Water Atlas of the United States,the only groundwater aquifer system below the alluvial one in <br /> this area is the Dakota-Glen Canyon Aquifer System.4 This is located beneath the Mancos Shale <br /> that underlays the site alluvium and will not be reach by mining or affected by mining. <br /> 7. Surface Water <br /> The 23 '/4 West Pit will interact with surface water in the area via runoff that enters the site. <br /> Drainage direction prior to mining is shown on Map C-1. Map C-2 shows the drainage direction <br /> during mining. Map F-1 shows the drainage direction once reclamation is complete. Map G-1 <br /> shows a comparison of the drainage patterns in all three stages of operational life. The priority <br /> for surface water protection at the 23 '/4 West Pit is preventing the discharge of sediment, oil, <br /> and/or hydraulic fluids from the operational areas. Oil and hydraulic fluids are contained on the <br /> site using standard best management practices related to the storage and transfer of such fluids. <br /> These include the use of secondary containment around storage and transfer points, spill kits, and <br /> employee training on safe handling practices. Sediment is trapped onsite using controls and best <br /> management practices related to directing and controlling surface water runoff that enters <br /> disturbed areas. <br /> 4 https://nubs.usgs.gov/ha/ha730/ch c/ <br /> 23 23 1/4 West ,f <br /> 1 4 G-4' X /:n-,1--,,.i and:lssocimm 11.I.< <br />