A contactor is planning to use an elevating scraper to grade a building site for a small construction that is located at an elevation of $3,000$ ft$.$ The scraper is powered by a four$-$cycle; $265-$horsepower naturally respirated engine. The material to be removed is dry common earth weighing $2,750$ lb$/$BCY with a swell estimated to be $20\%.$ The excavator material will be moved over a $2,000-$ft haul road for disposal. The haul road has an uphill grade of $2\%$ when travelling from the construction site to the dump area. The rolling resistance of the haul road is estimated to be $60$ lb$/$ton$,$ and the coefficient of traction is estimated to be $0\mathrm{.}5.$ The contractor obtained the following information from the manufacturer$$s literature for the elevating scraper. Loading time is $1\mathrm{.}1$ min$/$cycle$.$ The scraper requires $0\mathrm{.}5$ min$/$cycle to turn and dump the material and spot and delay can be negligible for an average job condition.