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C 3• Topsoil Placement of Hackfilled Pit. <br />C <br /> <br />Amount of topsoil to be hauled - <br />Assume 25 percent swell - <br />Use 2 CAT 631-D scrapers - <br />Estimated level haul - <br />Haul distance - <br />Produetion rate - <br />Use CAT DS-L for support <br />12,880 BCY <br />16,100 LCY <br />5x rolling resistance <br />1,700 feet one xay <br />400 HCY/operated hour/scraper <br />Total Cycle Time <br />Loading time - <br />Travel time (full) - <br />Dump time - <br />Return time (empty) - <br />.8 minutes <br />1.4 minutes <br />.7 minutes <br />1.1 minutes <br />4.0 minutes <br />Number of passes per hour = 60 minutes/hour = <br />4 minutes/pass <br />15 passes per scheduled hour = 400 BCY/operated hour (see page <br />283, CAT Handbook, Edition 14) <br />Mechanical availability = .90 <br />Operational availability = .95 <br />Total topsoil productlon/scraper = 342 BCY/scheduled hear <br />12.880 BCY <br />Number of hours required = 342 BCY/sch hr -~38~scheduled hours <br />= 32 operated hours ~ <br />OoeratinK Costs <br />CAT 631-D scrapers = op hr x 32 operated hours $4,777 <br />CAT D8-L = 84'22 x 32 operated hours = $2,695 <br />op hr <br />Labor Costs <br />Scraper operator = 38 scheduled hours x 11'50 = $437 <br />sch hr <br />Dozer operator = 38 scheduled hours xsch hr = $352 <br />Topsoil placement costs $8,261 <br />s <br />~~/~~ <br />