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6. Known aquifers <br /> According to the U.S. Geological Survey's Ground Water Atlas of the United States, the only <br /> bedrock groundwater aquifer system in this area is the Rio Grande aquifer system.4 Depth to <br /> water table in the permit area varies depending on location and time of year but may exceed <br /> 100 below ground surface. This depth will not be reach by mining or affected by mining. The <br /> San Luis Valley aquifer exists at a shallower depth, and is located in the valley alluvium and fill <br /> that predominates in the area. The depth to this local aquifer was approximately 8 feet in 1980 <br /> and is currently approximately 15 feet. Regional data shows local groundwater from wells even <br /> deeper(40+ feet deep). <br /> 7. Surface Water <br /> The Mystic Soil site is essentially flat. Drainage direction prior to mining is shown on Map C-1. <br /> Map C-2 shows the drainage direction during mining. Map F-1 shows the drainage direction <br /> once reclamation is complete. The priority for surface water protection at the Mystic Soil is <br /> preventing the discharge of sediment, oil, and/or hydraulic fluids from the operational areas into <br /> Lateral Forty-seven of the Farmers Union Canal. Oil and hydraulic fluids are contained on the <br /> site using standard best management practices related to the storage and transfer of such <br /> fluids. These include the use of secondary containment around storage and transfer points, spill <br /> kits, and employee training on safe handling practices. Sediment is trapped onsite using <br /> controls and best management practices related to directing and controlling surface water runoff <br /> that enters disturbed areas. <br /> 4https://pubs.usgs.gov/ha/ha730/ch c/ <br /> Mystic Soil <br /> October 2022 G-4 Lewicki&Associates <br />