Question: A contractor encounters a shale formation at a shallow depth in a cut section of a project. Seismographic tests indicate a seismic velocity of 6,500

A contractor encounters a shale formation at a shallow depth in a cut section of a project. Seismographic tests indicate a seismic velocity of 6,500 fps for the shale. On this basis, it is proposed to rip the material with 370 hp crawler tractor. Estimate the production in bcy for full-time ripping, with efficiency based on a 50 min hour. Assume that the ripper is equipped with a single shank and that ripping conditions are rated average (that is intermediate between extreme conditions). The normal O&O cost excluding operator for the tractor-ripper combination is $98.00 per hour. This is clashed as heavy ripping. Using your estimate of hourly production, estimate the oping unit-production cost in dollars per bcy without operator? (Note: For heavy ripping applications, increase normal O&O costs by 40%). 276 bcy/hr $0.506/bcy) 276 bcy/hr. $0.487/bcy O 376.bcy/hr. $0.448/bcy 306.25 bcy/hr. $0.448/bcy)

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