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Mine Area Seneca II W <br />Project Facilities-Permanent Roads <br />Task Rio Subarade <br />WORFCSHEEr NO. PR-1 <br />PRODUCPiVITSt FOR DOZER USE - RIPPING <br />Ripping Activity: After surface material is removed, rip to a depth of three feet to <br />aid in plant growth <br />Dozer/Ripper Used: D-i1N, 3 shank ripper, U Blade <br />Description of Ripping: <br />rip depth = 3' Volume = 3' x 34' x 6,000' = 22,700 <br />cut spacing = 6.15' per pass 3' x 12' x 16,000' = 21.350 <br />cut length = 300' 44,050 <br />Productivity Calculations: <br />Cycle time = ( 300_) ft / 88 ) + 0.25 = 3.66 min/pass <br />• cut length speed turn <br />time <br />Passes/hour = 45_ min/hr / 3.66_ min/pass = 12.3_ passes/hr <br />work hr. factor cycle time <br />Volume cut = ( 3 ft x 6.15 ft x 300 ft) / 27 cf/cy = 205 bcy/pass <br />per pass tool cut cut <br />penetration spacing length <br />Ripping Production = 205 bcy/pass x 12.3 passes/hr = 2,522_ bcy/hr <br />Hours Rerniired = ( 44.050 bcy / 2,522 bch/hr) x = 18 hrs <br />volume hourly <br />to be ripped production <br />COSt = $254.98 <br />Total Cost = 18 hrs. x 254.98 cost/hr = 4 590 <br />References: <br />Tables 25-2-5 <br />Attachment 25-2 <br />25-4-7 <br />