2022-05-06_REVISION - M1998105 (3)

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In the event of flooding at the site, equipment from the active mining floor will be removed, and the pit pump will be disabled allowing the pit to fill with water. The flooded pit will be pumped only after the flood has subsided. All fuel will be stored at least one foot above the base flood elevation and in sufficient secondary containment with 110% carrying capacity. 4. Wetlands The National Wetlands Inventory aerial-based mapping indicates the presence of wetlands within the permit area. These wetlands are mostly associated with the vegetated banks in the north of the site and the various irrigation ditches crossing the property. The areas indicated in the north are likely to be actual wetlands based on previous permitting, however, no mining will take place in these potential wetland zones. Some potential wetlands crossing the mining area are those associated with the Relief Ditch and a historical irrigation ditch that has since been rerouted. Their locations crossing the mining area is the probable result of low GIS accuracy, as these areas are already disturbed with no vegetation with a small area of irrigated fields. Therefore, it is highly unlikely that the mining operation will disturb any wetlands. Nonetheless, Elam Construction commits to conducting a wetlands survey prior to disturbing any potential wetlands. 5. Aquifers The only identified aquifer located at the site is the shallow alluvial aquifer of the Gunnison River. The depth to this aquifer varies throughout the year but is typically four to five feet below surface. According to the U.S. Geological Survey's Ground Water Atlas of the United States', the underlying bedrock aquifer is the Dakota Glen Canyon Aquifer. This aquifer is located approximately 2,000 feet below the surface at the Delta Paving Site so it will not be reached or affected from the mining operation. 6. Surface Water The mining operation will impact surface water in the area through the stormwater runoff that enters the site. Maps C-1, C-2, and F-1 show the drainage patterns and how they are affected throughout the life of the mine. The maps include information on the drainage basins currently, during mining, and post reclamation as well as the drainage directions throughout these stages. The primary concern for surface water protection at the site is preventing the discharge of sediment, oil, and/or hydraulic fluids from the operation areas. Oils and hydraulic fluids are stored on site following the standard best management practices. These practices include the use of secondary containment at fluid storage and transfer points, spill kits, and employee training regarding safe handling practices. Sediment is trapped onsite using controls and best ' https:Hpubs.usgs.gov/ha/ha730/ch_c/ Delta Paving Gravel Pit April 2022 G-2 Lewicki&Associates