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F,f le Gr8✓c' PI? #1 March 2021 <br /> There are no existing wells on the Rifle Pit property. Nearby wells that have been identified <br /> are located Figure 4 Exhibit C, using GIS data from the DWR-SEO. The closest operating <br /> wells are on the adjacent property to the north, owned by Colorado River Ranch, LLC but <br /> are over 600 feet from the mining permit boundary. The dewatering pipeline installations are <br /> temporary and should not impact these wells. If any impact is detected by the well owners, <br /> Scott will work with them to restore full function of said wells. Two other wells within 600 feet <br /> of the permit boundary have been identified but are unused. <br /> 8.4 Surface Water <br /> The Colorado River is generally located north of the mining area and comes as close as <br /> approximately 0.25-mile northwest of the mining area. The property currently has a return <br /> channel of the Last Chance Ditch, which generally bisects the property from east to west <br /> and discharges into the Colorado River. The Last Chance Ditch is located south of the <br /> property on the south side of Interstate 70. The wetlands that are on site were created by <br /> irrigation activities, see Section 4.3 discussion, and will likely disappear in a relatively short <br /> period of time following the onset of dewatering. An existing irrigation tailwater ditch runs <br /> across the property east to west and ultimately discharges into the Colorado River. During <br /> the initial stages of mining, Scott will not disturb the tailwater channel in its existing location <br /> and implement BMPs to prevent mining operations from discharging into or commingling <br /> with these waters. Scott will install a low-water crossing at the existing tailwater channel <br /> crossing or collect the channel in a pipe. See Figure 4, Exhibit C, and drawings in <br /> Attachment A. <br /> 8.5 Water Management <br /> Incidental runoff moving away from pits and working areas will be controlled using standard <br /> stormwater BMPs. A Colorado Discharge Permit System (CDPS) Construction Stormwater <br /> Permit will be acquired from the CDPHE-WQCD prior to any discharge. See previous water <br /> handling discussions in this document. <br /> 8.6 Project Water Requirements <br /> Rule 6.4.7 requires the operator/applicant shall provide an estimate of the project water <br /> requirements including flow rates and annual volumes for the development, mining and <br /> reclamation phases of the project. The following subsections outline the estimated project <br /> water requirements estimating methods with a summary of the annual active mining and <br /> post-mining demands shown in Table 3 and Table 4, respectively. This information reflects <br /> full development of the property for pending future development of the full site. <br /> 8.6.1 Water Requirements During Mining Phase <br /> During active mining, depletions to the Colorado River will occur from water lost with mined <br /> aggregate(trucked offsite with mined aggregate)and water used for dust control. Depletions <br /> are not expected from evaporation associated with dewatering efforts; Scott plans to <br /> intercept any groundwater with perforated pipe and pump it to the dewatering pipeline <br /> without evaporation. Gravel pit operations also typically include domestic or commercial <br /> indoor uses; however, Scott expects to provide trucked water from offsite for indoor water <br /> use. <br /> 31 <br />