2021-08-19_PERMIT FILE - M2021052

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Rifle Gravel Pit#1 August 2021 Evaporation from the post-mining finished pond will require a decreed augmentation plan. Active mining operations may be covered by the same augmentation plan or may temporarily be covered by an SWSP. Scott Contracting, Inc. will file a Water Court application or contract with West Divide Water Conservancy District(or similar agency) under their decreed umbrella protection plan for an augmentation plan to replace depletions from the Rifle Pit operations (after active mining operations and potentially during active mining operations). The process of obtaining a project specific court-approved decreed augmentation plan can take from 1-3 years, depending on negotiations with the Division of Water Resources (DWR- SEO) and any potential opposers. Therefore, Scott Contracting, Inc. will also file an application for a SWSP which will allow the gravel pit to operate without causing injury to other water rights holders before a final decree is entered, with temporary approval from the SEO. An SWSP can only be approved for one year, but the applicant may request renewal of the SWSP by repeating the application. There are no existing wells on the Rifle Pit property. Nearby wells that have been identified are located Figure 4 Exhibit C1, using GIS data from the DWR-SEO. The closest operating wells are on the adjacent property to the north, owned by Colorado River Ranch, LLC but are over 600 feet from the mining permit boundary. The dewatering pipeline installations are temporary and should not impact these wells. If any impact is detected by the well owners, Scott Contracting, Inc. will work with them to restore full function of said wells. Two other wells within 600 feet of the permit boundary have been identified but are unused. 8.4 Surface Water The Colorado River is generally located north of the mining area and comes as close as approximately 0.25-mile northwest of the mining area. The property currently has a return channel of the Last Chance Ditch, which generally bisects the property from east to west and discharges into the Colorado River. The Last Chance Ditch is located south of the property on the south side of Interstate 70. The wetlands that are on site were created by irrigation activities, see Section 4.3 discussion, and will likely disappear in a relatively short period of time following the onset of dewatering. An existing irrigation tailwater ditch runs across the property east to west and ultimately discharges into the Colorado River. During the initial stages of mining, Scott Contracting, Inc. will not disturb the tailwater channel in its existing location and implement BMPs to prevent mining operations from discharging into or commingling with these waters. Scott Contracting, Inc. will install a low-water crossing at the existing tailwater channel crossing or collect the channel in a pipe. 8.5 Water Management Incidental runoff moving away from pits and working areas will be controlled using standard stormwater BMPs. A Colorado Discharge Permit System (CDPS) Construction Stormwater Permit will be acquired from the CDPHE-WQCD prior to any discharge. See previous water handling discussions in this document. 8.6 Project Water Requirements Rule 6.4.7 requires the operator/applicant shall provide an estimate of the project water requirements including flow rates and annual volumes for the development, mining and reclamation phases of the project. The following subsections outline the estimated project water requirements estimating methods with a summary of the annual active mining and post-mining demands shown in Table 3 and Table 4, respectively. This information reflects full development of the property for pending future development of the full site. 44