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• Intercepted groundwater will cause drawdown of groundwater potentiometric levels in the <br /> fractured granodiorite within the quarry area and to the west of the quarry and south of Little <br /> Turkey Creek. Impacts to the groundwater system are limited and localized, and will be <br /> minimized by mine planning and operational procedures. As excavation will remain at least <br /> 10 feet above the level of the adjacent Little Turkey Creek, localized drawdown from quarry <br /> development will remain above the creek elevation, and there will be no impacts to groundwater <br /> north of Little Turkey Creek. <br /> • An evaluation of potential drawdown impacts from the quarrying operation indicates that, at <br /> maximum quarry development, a drawdown of between 1 and 5 ft might occur at three domestic <br /> wells, Permit#173310, #185992 and #185659, located within a half-mile west of the HRR <br /> property on the south side of Little Turkey Creek. The very low bulk hydraulic conductivity of <br /> the fractured rocks in the south ridge limits the extent of the drawdown. This minimal drawdown <br /> will likely have a negligible impact on the productivity of the three potentially affected wells. <br /> The #34643 well, that is suspected of being incorrectly located, has been included in the impact <br /> evaluation,and the projected drawdown at that location is between 5 and 10 feet. Transit Mix has <br /> submitted a Substitute Water Supply Plan (SWSP) and is in the process of securing groundwater <br /> permits, if necessary,to mitigate any negative productivity impacts to these wells. <br /> • Little Turkey Creek is a source of groundwater recharge downgradient of the West Fault. There <br /> will be no net impact to surface flows in Little Turkey Creek. Intercepted groundwater that <br /> would have eventually discharged to Little Turkey Creek will be captured and redirected to Little <br /> Turkey Creek. Any evaporative losses in the ditch and pond system will be more than offset by a <br /> decrease in evapotranspiration losses from vegetation cleared in the quarry area. <br /> • The HRR aggregate operation will be developed within a deposit of inert granitic rock and no <br /> acid-forming or toxic producing materials were identified during the exploratory drilling and <br /> sampling program; therefore, no release of pollutants to groundwater is expected. Quarrying <br /> operations will be conducted using best management practices to ensure that any water released <br /> from sediment detention basins will not detrimentally effect water quality in Little Turkey Creek. <br /> • A water monitoring plan for both surface and ground water has been developed and is being <br /> implemented to establish baseline conditions at the site and for long-term monitoring of <br /> groundwater and surface water quantity and quality. Transit Mix is coordinating with the State <br /> Engineer to mitigate any potential impacts to groundwater and maintain the prevailing hydrologic <br /> balance of the surrounding area. A Substitute Water Supply Plan (SWSP) has been submitted <br /> prior to the DRMS permit application submittal. <br /> TRANSIT MIX-HITCH RACK RANCH <br /> HYDROGEOLOGY AND IMPACT ANALYSIS <br /> 1-3 <br />