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o Transit Mix Concrete Co. <br /> 444 E.Costilla Street, Colorado Springs,CO 80903 Office: (719)475-0700 Fax: (719)475-0226 <br /> o Determine adjusted bulk explosive column height and amount of <br /> stemming required by survey results. <br /> • Proper blast hole loading, ensuring hole quality is adequate and explosive column <br /> height and stemming material heights meet calculated requirements for safety. <br /> o Use of drill log. <br /> o Measure height of explosive column during loading. Compare <br /> expected hole load with load recorded by bulk delivery truck. <br /> Leave desired amount of empty drill hole to accommodate planned <br /> or adjusted amount of stemming. <br /> • Setting up blast patterns so that the direction of the blast will be away from <br /> permanent manmade structures, and away from adjacent permit boundaries. <br /> o Transit Mix will strive to clean broken rock and or muck pile from <br /> face and toe of bench to be blasted before loading. This will <br /> facilitate rock movement in forward direction. <br /> • Using appropriate blast pattern timing sequences so the pattern is shot <br /> systematically and in proper order <br /> • Filling the remaining open portion of any blast hole with stemming (crushed <br /> stone)to contain the explosion and minimize chances of flyrock. <br /> o Use only crushed rock stemming. (1/4 size of drill hole) <br /> o Where short benches are to be blasted with minimal relief(open <br /> face for movement) and near to the mining boundaries other <br /> engineering controls will be used in addition to crushed rock <br /> stemming. <br /> Documentation: <br /> The third party blasting contractor will prepare a paper record of each blast that is <br /> completed at the quarry. Copies of each blast report will be kept on file in the scale <br /> house/office building for reference. All records, including blast statistics and blast <br /> monitoring, will be kept on file for a minimum of three years. At a minimum the <br /> following information will be collected and kept in record for each blast: <br /> • Name of operator conducting the blast <br /> • Location, date, and time of blast <br /> • Name, signature, and license number of the blaster in charge <br /> • Identification, direction and distance from the nearest blast hole to the nearest <br /> man-made structure, in feet. <br /> • Weather conditions, including temperature, wide direction, and approximate <br /> velocity <br /> • Type of material blasted <br /> • Sketches of the blast pattern including number of holes, burden, spacing, and <br /> delay pattern <br /> • Sketches showing decking, if applicable <br /> • Diameter and depth of holes <br /> • Types of explosives used <br /> 16 <br />