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ri <br /> ' o Tr ansit Mix Concrete Co. <br /> Objection: Blasting operations are likely to cause vibrations, fly rock or rock falls that will damage <br /> houses. They are concerned about their safety at their home or while travelling the road. The objector <br /> claims that Little Turkey Creek Road may be damaged by the quarry operation by fly rock or premature <br /> rock falls caused by blasting. <br /> Response: The engineering analysis included in Exhibit S of the original permit application specifically <br /> discusses these potential impacts to Little Turkey Creek Road and demonstrates that the road will not be <br /> damaged by the quarry operation. All nearby houses are more than 200 feet from the affected lands <br /> boundary;therefore, an engineering analysis of these structures is not required by the Division. The <br /> homes are sufficiently far from the quarry area to avoid any damage from blasting operations. Transit <br /> Mix will also offer pre-blast surveys to all structure owners within% mile of the permit boundary;this <br /> radius exceeds OSMRE guidelines by 50%. <br /> Transit Mix has proposed to secure the road near the quarry area specifically out of an abundance of <br /> caution for the safety of passing vehicles. No fly rock is ever expected to reach Little Turkey Creek Road <br /> or any nearby houses. Transit Mix must and will control fly rock by using a certified and qualified <br /> blasting consultant and by engineering blast patterns and explosive volumes to minimize fly rock <br /> potential. This primarily involves having the ability to use smaller blasts,which create less energy and <br /> have less potential for fly rock. <br /> Objection: The hydrologic analysis ignores the cautions in Exhibit K: Climate regarding using <br /> precipitation values measured at the Colorado Springs Airport for design purposes at a site located in <br /> the foothills. <br /> Response: The precipitation values presented in Exhibit K were not used for the designs included in <br /> Exhibit G. Exhibit K presents mean annual precipitation for the Colorado Springs metropolitan area, and <br /> hydrologic analyses are performed using various sizes of design storms. These design storms are <br /> calculated by the National Oceanic and Atmospheric Administration (NOAA) using rigorous statistical <br /> analyses of multiple sites in the region. NOAA recently updated their design storm calculations for <br /> Colorado in NOAA Atlas 14,which slightly decreased the precipitation depths from the previous analysis <br /> included in NOAA Atlas 2. The El Paso County Drainage Criteria Manual (EPCDCM) addresses the recent <br /> data calculations and requires structures be designed with the out-of-date data to be conservative.All <br /> structures were designed following EPCDCM;therefore,they are not under-designed. <br /> Objection: The application does not demonstrate that there will not be any unauthorized release of <br /> pollutants to the surface drainage system or to groundwater. Specific materials include silica dust, <br /> sediment from operations areas and fines piles, and various hazardous materials listed in the Hazardous <br /> Materials Management Plan. The hazardous materials listed in the plan are not included in the <br /> monitoring plan. The operator has not committed to monitoring ground and surface water through the <br /> life of the mine. <br /> Response: All waters discharged from the site will be regulated by a NPDES discharge permit obtained <br /> from the Colorado Department of Public Health and Environment(CDPHE) Water Quality Division <br /> (WQD). This discharge permit will have specific effluent limitations and monitoring requirements. <br /> Hitch Rack Ranch Quarry Response to Comments <br /> March 9,2018 19 <br />