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Rifle Gravel Pit #1 January 2020 <br /> 5.2.1.2 Water Handling and Dewatering <br /> SCI will permit and drill a dewatering well at the northwest end of the site to lower the <br /> groundwater during this phase. This dewatering activity will support aggregate mining <br /> preparation (Phase 2). Note pumped water from this well will be piped and discharged into <br /> the ditch and conveyed to the Colorado River. No additional water diversions nor <br /> impoundments will be required during this phase. <br /> 5.2.2 Mining Preparation (Phase 2) <br /> This phase of the project will include mobilization of the heavy equipment, work trailer, <br /> screening and wash equipment, and major site grading to prepare the site for mining <br /> activities. <br /> 5.2.2.1 Topsoil and Overburden Handling <br /> This phase of the project will include additional minor site grading and vegetation removal, <br /> as needed. Equipment for this phase will include, but not be limited to, a bulldozer, track- <br /> hoe, and a 35-ton haul truck. <br /> 5.2.2.2 Water Handling and Dewatering <br /> Phase 1 dewatering activities will continue throughout this phase. No additional water <br /> diversions nor impoundments will be required during this phase. <br /> 5.2.2.3 Schedule of Operations <br /> The Rifle Gravel Pit will operate from 7 am to 7 pm Monday through Friday, and weekends, <br /> as needed. Approximately 3 to 5 employees will be on site during this phase of the mining <br /> operations. No nighttime activities are anticipated. Occasional equipment repair, or <br /> maintenance may be conducted at night, but lighting will be kept to a minimum and directed <br /> inward; the site will not have ambient lighting. <br /> 5.2.2.4 Explosives <br /> Explosives will not be used during mining or reclamation of the property. <br /> 5.2.3 Mining Extraction (Phase 3 — in 5 Stages) <br /> Mining extraction operations will take place in 5 extraction stages. Stage 1 of the mining <br /> extraction operation will start in the southeastern quadrant of the site. At this location, the <br /> crusher will be placed at the current grade and mining the mineral out to the lowest elevation <br /> of the gravel. Once this area is mined out, the crusher will be set on the floor of the pit for <br /> Stage 2 of the mining extraction operation. Stage 2 will take place in the northeastern <br /> quadrant of the property following Stages will proceed in a counterclockwise rotation around <br /> the property (Figure 9, Exhibit D). <br /> The location of the mining equipment in the bottom of the pit will support mitigation of the <br /> mining noise and dust. All stockpiling of material at this point also be done at this level. Each <br /> following stage (3 through 5) will follow this method throughout the mining extraction <br /> process at this site. <br /> 15 <br />