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• <br /> <br />TASK 3 <br />RIP ROADS TO 3' DEPTH <br />Ripping Requirement <br /> <br />Approximately 11,500' of access and haul road, averaging 30' wide, with ripping to 3' <br />depth. 38,300 cy <br />Equipment and Productivity <br />Use a CAT D9R DS Tracked Dozer w/3-Shank Ripper <br />Productivity -Approximately 1,500 cy (in-place) per hour assuming a seismic velocity of <br />approximately 4,000 ft./sec. Using an operating factor of 0.83 (50 minutes operation per <br />scheduled hour) results in an adjusted productivity of 1,245 cy (loose)/hr. <br />Equipment Hours and Cost <br />Ripping would require 31 dozer hours to complete (4 days at 8 hours per day). <br />31 hrs. x ($150.96/hr. (D9R Dozer)) _ $4,680 <br />• <br />~J <br />L-5 <br />Revised May 1998 <br />