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BLASTING <br />Although the general sequence of blasting has remained the same there <br />have been several modifications to the blasting plan. As a result, it <br />has been rewritten as follows. <br />The Colorado Yampa Coal Company will engage in blasting of overburden and <br />coal before removal by draglines, front-end loaders or a hydraulic <br />excavator. The general sequence for drilling and blasting of overburden <br />and coal will be as follows: <br />1. Establish drill bench on overburden. <br />2. Drill blasting pattern. <br />3. Load drill holes with explosives. <br />4. Blast overburden. <br />5. Remove blasted overburden with draglines. <br />6. Clean top of uncovered coal seam. <br />• 7. Drill blasting pattern. <br />8. Load drill holes with explosives. <br />9. Blast coal seam. <br />10. Remove blasted coal with hydraulic excavator/front-end loader and <br />coal haulers. <br />The maximum number of blast holes per 8 millisecond delay for over- <br />burdened coal is calculated from the modified scaled distance equation <br />This formula is currently in use by the Colorado Yampa Coal Company and <br />has been modified and approved by CMLRD Sept. 2, 1981. The modified <br />scaled distance formula is based on blast vibration data collected for <br />the Energy #1 Mine and developed such that the peak particle velocity <br />limit of 1 inch per second is not exceeded. Colorado Yampa Coal Company <br />will comply with all applicable state and Federal laws in its use of <br />explosives. All blasting operations will be conducted by experienced, <br />trained and competent persons who possess a valid certification in <br />accordance with appropriate Federal and state laws. Permit Renewal <br />Permit Renewal 780-44-1 <br />