An earthmoving contractor encounters a shale formation at shallow depth in a rock cut. He performs...

 

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An earthmoving contractor encounters a shale formation at shallow depth in a rock cut. He performs seismographic tests, which indicate a seismic velocity of 5000 fps for the material. On this basis, he proposes to rip the material with a 370-hp dozer. Estimate the production in bcy, for full-time ripping, with efficiency based on a 45-min hour. Assume that the dozer is equipped with a single shank and that ripping conditions are adverse. The normal O&O cost per hour, including operator for a 370-hp dozer with ripper is $111. This work would be classified as a heavy ripping application. Using your estimate of hourly production, estimate the ripping unit-production cost in dollars per bcy. An earthmoving contractor encounters a shale formation at shallow depth in a rock cut. He performs seismographic tests, which indicate a seismic velocity of 5000 fps for the material. On this basis, he proposes to rip the material with a 370-hp dozer. Estimate the production in bcy, for full-time ripping, with efficiency based on a 45-min hour. Assume that the dozer is equipped with a single shank and that ripping conditions are adverse. The normal O&O cost per hour, including operator for a 370-hp dozer with ripper is $111. This work would be classified as a heavy ripping application. Using your estimate of hourly production, estimate the ripping unit-production cost in dollars per bcy.

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