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Surface Blasting Work Cont’d Task# 001 Page 3 of 3 <br /> <br />CIRCES Cost Estimating Software <br />Drill bits: Bit life = 1,750 Linear feet $2,738.47 20.911 $57,265.32 <br /> Total Materials Cost: $368,801.74 <br /> <br /> <br /> <br />DRILLING AND EXPLOSIVES PREPARATION TIME <br /> Total Drilling Length: 36,595 linear feet <br /> Unadjusted Drilling Rate: 82.00 feet/hour <br /> Drilling Time: 740.10 hours <br /> <br />Job Condition Corrections: <br />Site Altitude: 7,800 feet <br /> Altitude Adjustment: 0.90 (DRMS est.) <br /> Job Efficiency Factor: 0.67 (CH. Exc. HB) <br /> Adjusted Drilling Rate: 49.45 feet/hour <br /> Explosives Prep. Time: 139.05 hours <br /> <br />JOB TIME AND COST <br /> <br /> Total Job Time: 879.15 Hours <br /> <br />Unit cost: <br /> <br />$2.032 <br /> <br />per cu. yd. <br /> <br />Total Job Cost: <br /> <br />$1,381,065 <br />