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Rlflt=; Gra�vcl PI- #1 Idl'11 c3(j! L02.3 <br /> Any agricultural return flows in the tailwater ditch, which are estimated at <2 cubic feet per <br /> second (cfs) during peak irrigation season, will be incorporated into the pond, mixed with the <br /> alluvial aquifer, and eventually migrate laterally through the permeable gravels into the <br /> larger Colorado River water table. Given the minimal flows in the ditch, the large size of the <br /> pond (estimated at 6 acres within one year), and the highly permeable nature of the gravel, <br /> the agricultural return flows will have a negligible effect on water levels in the pond. As <br /> excavation proceeds, the tailwater ditch will be subsumed into the expanding pond <br /> boundaries, until under final conditions the discharge point will be where the ditch enters the <br /> eastern boundary of the property. <br /> 5.2.4 Explosives <br /> Explosives will not be used during mining or reclamation of the property. <br /> 5.2.5 Schedule of Operations <br /> At this time, the proposed mine would operate daily, with excavation and processing <br /> occurring 8 months of the year (roughly April — November) and with material sales occurring <br /> year-round. Total recoverable volume is estimated at approximately 292,810 CY of <br /> aggregate, which is expected to support operations for between three and five years. <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 /> 5.2.6 Existing or Proposed Roads <br /> No existing nor proposed roads will be used for the mining operation on-site. Scott will <br /> designate temporary travelways on the operating surface of the mine on a flexible and as- <br /> needed basis, to account for the changing layout of the mine as excavation proceeds. These <br /> travelways would consist of the native gravel materials exposed after removal of the <br /> overburden, supplemented with a surface of roadbase approximately 3" thick to control mud. <br /> The travelways on the working surface of the mine would not be permanently compacted, <br /> surfaced, or otherwise constructed. A portion of CR-346 (1-70 Frontage Road) will be <br /> improved as described in the CDOT Access Permit (Attachment B) and used for access to <br /> and from the site. <br /> 5.2.7 Drainage and Runoff Conveyance <br /> Previous sections of this application describe the water handling activities for this proposed <br /> project. <br /> 5.2.8 Reclamation (Phase 4) <br /> This section describes the earthmoving and reclamation activities and size of the areas to <br /> be worked during Phase 4. <br /> Reclamation will proceed in concert with the excavation (see Figures 9, 10, and 11). A six- <br /> foot wide fringe of 5:1 slope will be left at the inner edge of the perimeter berm and planted <br /> with wetland reclamation species. The intention is for the six-foot wide fringe to be nearly <br /> inundated during high-water periods as the water table rises, and then to be progressively <br /> exposed as the water table drops during the growing season. The remainder of the pit slope <br /> to the bottom of the pond will be approximately 3:1, not to exceed 2:1. Note that this <br /> 32 <br />