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flood has passed. All fuel storage onsite will be maintained elevated at least one foot above the <br /> base flood elevation and in secondary containment sufficient to hold 110% of the stored fuel. <br /> Mining will not take place within 300 feet of the Colorado River prior to the construction of <br /> inlet/outlet structures. These structures are outlined on Map C-3. Prior to mining within 300-ft <br /> of the Colorado River, the applicant will provide the Division with a technical revision <br /> outlining design specifics of these structures. These design specifications will be in <br /> accordance with the Urban Drainage and Flood Control District, Technical Review Guidelines <br /> for Gravel Mining & Water Storage Activities Within or Adjacent to 100-Year Floodplains. Map <br /> C-3 shows the potential structure designs for reference. <br /> 3. Wetlands <br /> WSM commissioned a wetlands survey of the site conducted by Environmental Solutions Inc <br /> (ESI) to determine the extent of wetlands that are present onsite. This survey is attached to the <br /> application in Exhibit J. Wetlands will not be disturbed by early mining. Prior to wetland <br /> disturbance, the applicant will secure any applicable US Army Corps of Engineers (USACOE) <br /> permits. No fill of wetlands will take place prior to securing said USACOE permits. <br /> 4. Location on Map <br /> See Map C-1 for the location of all tributary water courses, wells, springs, stock water ponds, <br /> reservoirs, and ditches on the affected land and on adjacent lands where such structures may <br /> be affected by the proposed mining operations. <br /> 5. Known aquifers <br /> The only known aquifer in the area is the shallow alluvial aquifer of the Colorado River. Depth to <br /> water table is expected to be found at four feet below ground surface, based on the depth to <br /> groundwater experienced by the operator at the Grand River Park operation to the southeast. <br /> According to the U.S. Geological Survey's Ground Water Atlas of the United States, the only <br /> groundwater aquifer system below the alluvial one in this area is the Unita-Animas Aquifer <br /> System.4 This is located beneath the Mancos Shale that underlays the site alluvium and will not <br /> be reach by mining or affected by mining. Mining will stop at least two feet above the shale <br /> bedrock. <br /> 6. Surface Water <br /> The North Hangs Mine will interact with surface water in the area via runoff that enters the site. <br /> Map G-1 shows a comparison of the drainage patterns in all three stages of operational life. The <br /> priority for surface water protection at the North Hangs Mine is preventing the discharge of <br /> 4 https://pubs.usgs.gov/ha/ha730/chc/ <br /> North Hangs <br /> December 2024 G-2 Lewicki & Associates <br />