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Grand Junction Pipe & Supply Co. commits to conducting a wetlands survey prior to disturbing <br /> any potential wetlands. <br /> 5. Aquifers <br /> The only identified aquifer located at the site is the shallow alluvial aquifer of the Gunnison <br /> River. The depth to this aquifer varies throughout the year but is typically four to five feet below <br /> surface. According to the U.S. Geological Survey's Ground Water Atlas of the United States', <br /> the underlying bedrock aquifer is the Dakota Glen Canyon Aquifer. This aquifer is located <br /> approximately 2,000 feet below the surface at the Delta Paving Site so it will not be reached or <br /> affected from the mining operation. <br /> 6. Surface Water <br /> The mining operation will impact surface water in the area through the stormwater runoff that <br /> enters the site. Maps C-1, C-2, and F-1 show the drainage patterns and how they are affected <br /> throughout the life of the mine. The maps include information on the drainage basins currently, <br /> during mining, and post reclamation as well as the drainage directions throughout these stages. <br /> The primary concern for surface water protection at the site is preventing the discharge of <br /> sediment, oil, and/or hydraulic fluids from the operation areas. Oils and hydraulic fluids are <br /> stored on site following the standard best management practices. These practices include the <br /> use of secondary containment at fluid storage and transfer points, spill kits, and employee <br /> training regarding safe handling practices. Sediment is trapped onsite using controls and best <br /> management practices by directing and controlling surface water runoff that enters the disturbed <br /> areas. More information on sediment and surface water control is provided below. <br /> 6.1 . Surface Water Handling <br /> There are three drainage basins that collect all stormwater runoff on and around the Delta <br /> Paving site. These can be seen in Maps C-1, C-2, and F-1 The first is approximately 63 acres <br /> and includes the areas in the east of the site that contain the reclaimed lake, currently disturbed <br /> area, irrigated fields, and part of the vegetated area in the north. This basin is isolated from <br /> offsite surface water, and all water within this area drains to the existing lake in the center of the <br /> site. Water collected in the lake is then pumped to the permitted outfall location in the Relief <br /> Ditch. The pump allows for the water discharge rate to be controlled preventing erosion of the <br /> drainage ditch. <br /> The second drainage basin is approximately 29 acres encompassing the southern portion of the <br /> permit area and the connected fields to the south. All water within this area drains to the <br /> northwest of the fields where it eventually infiltrates into the native soil. The third drainage basin <br /> is approximately 40 acres of irrigated fields and vegetated banks in the west of the permit area. <br /> 1 https://pubs.usgs.gov/ha/ha730/ch_c/ <br /> Delta Paving Gravel Pit G-3 Lewicki&Associates <br /> September 2022 <br />