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OCT-I9-OT 10:53A11 FROtFRL <br />..~. <br />~- <br />u= <br />+303 866 5395 <br />T-042 <br />ti_ Issne 7(E): Minimization of Potential Impacts to Prevailing Hydrologic Balance of <br />Carbon Irrigation Ditch (Rule 3.1.x. Rule 3.1.6 requires an applicant to m;n;m;>e <br />disturbances to the hydrologic balance of the affected land and of the surrounding area <br />and to the quantity or qualiry of surface and groundwater systems during mining and <br />reclamatiott_ Specific concerns include potential impacts to water wells in terms of water <br />quality, and to water quantity from the proposed mining operations and frorn blasting <br />vibrations; potential water quality impacts from the release of toxins, including iron gas, <br />in the overburden and mined material; and potential water quality impacts due to buried <br />toxins from earlier operations, With respect to the water quality and quanrity issue as it <br />relates to blasting, water to be used at the quarry will be sourced fram a well adjudicated <br />for industrial use and from an exempt well, properly petznitted with the Offfce of the <br />State Engineer. As long as the wells are operated in accordance their permits, any <br />consumptive use of grotmd water is acceptable. There are no perennial surface water <br />bodies within the area proposed for quarrying. Storm and snowmen nnrotl'will be <br />managed in accordance with a storm water permit required by the Colorado Aepartment <br />of Public Health and Environment, Water Quality Control bivision. Fuel storage at the <br />quarry shop will be installed in a previously constructed lined embayment sized to fully <br />contain catastrophic leakage of the largest tank. Quarry operations will be a tninimtun of <br />100 feet above the water table as it is expressed iu the quarry industrial well bore. 'I ltese <br />permit conditions protective of ground water make impacts to ground water quality <br />highly unlikely. With respect to potential toxins that could be released through the <br />mining process, the Division notes that the area to be mined has been subject to numerous <br />geologic studies. The rock to be mined is geochemically benign. With respect to <br />Flolcim/Coaldale, M-1977-247 <br />