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lid S: tt - F fle _rave! Gir <br /> 2.12 Gravel Extraction Activities <br /> Section 7-1002 of the LUDC requires the following information be addressed for Gravel <br /> Extraction activities. <br /> 2.12.1 Water Quantity and Quality Impacts/Floodplain Impacts <br /> The Rifle Pit site will not store flammable or explosive solids or gases other than those required <br /> to power and/or fuel the equipment and machinery. The site has been adequately designed <br /> to handle the storage of flammable or explosive solids or gases and that the methods comply <br /> with the national, State, and local fire codes and eliminate exposure to surface and ground <br /> waters. <br /> This project will not allow materials or wastes to deposited in areas susceptible to causing <br /> them to be transferred off the property. <br /> Per the Floodplain Overlay Regulations and Development in 100-Year Floodplain <br /> requirements included in Sections 3-301 and 4-109 of the LUDC, respectively, the site design <br /> will prevent: <br /> • Storage of fuel or hazardous materials including within the Floodway <br /> 2.12.1.1 Summary of Augmentation Plan for the Mining Operation <br /> To prevent injury to downstream water rights, the depletions from the Rifle Pit mining <br /> operations will have to be replaced in time,amount, and location during times of a downstream <br /> senior call. Some of this augmentation water can come from the dry-up of historically irrigated <br /> fields that are removed from irrigation (dried) when the use of the property changes to gravel <br /> mining. Whatever depletions are not covered by credits from the dry-up can be augmented <br /> with water from a contract with the Colorado River Water Conservation District(River District) <br /> or the West Divide Water Conservancy District(West Divide). <br /> Scott will file an application with water court for an augmentation plan decree to replace <br /> depletions from the Rifle Pit operations(both during and after active mining operations). It can <br /> take 1-3 years to go through the water court process and get a signed decree for an <br /> augmentation plan, depending on negotiations with the Division of Water Resources and any <br /> potential opposers. Therefore, Scott will also file an application for a Substitute Water Supply <br /> Plan (SWSP) which will allow the gravel pit to operate without causing injury to other water <br /> rights holders before a final decree is entered, with temporary approval from the State <br /> Engineer.An SWSP can only be approved for one year, but the applicant may request renewal <br /> of the SWSP by repeating the application. Estimates of water demands, and augmentation <br /> supply are discussed in detail in the SWSP, a copy of which can be provided upon request. <br /> Depletions associated with the mining operation include evaporation from the pond surface, <br /> evaporation from the exposed saturated gravels, and water used for dust control. These <br /> depletions are estimated at approximately 66 acre-feet per year during active mining, and <br /> approximately 44 acre-feet per year under final reclamation conditions. <br /> 2.12.2 Air Quality <br /> Scott understands that evidence needs to be submitted that that uses shall have current <br /> CDPHE air pollution permits and shall meet emissions standards. <br /> 2-18 <br />