# The contractor in Problem 1 has another project requiring the use of a large quantity of sand. He…

The contractor in Problem 1 has another project requiring the use of a large quantity of sand. He has located a good source of sand in a river that is 6,000 feet from the project site and has decided to dredge the sand with a 3-cubic-yard clamshell installed on a crane that is mounted on tracks. He also has decided to use the type of dump trucks described in Problem 1 to haul the sand to the project site. The sand weighs 2,400 pounds per loose cubic yard, and the cycle time for the clamshell is estimated to be 40 seconds. The project site is located at an elevation of 5,000 feet, and the

The contractor in Problem 1 has another project requiring the use of a large quantity of sand. He has located a good source of sand in a river that is 6,000 feet from the project site and has decided to dredge the sand with a 3-cubic-yard clamshell installed on a crane that is mounted on tracks. He also has decided to use the type of dump trucks described in Problem 1 to haul the sand to the project site. The sand weighs 2,400 pounds per loose cubic yard, and the cycle time for the clamshell is estimated to be 40 seconds. The project site is located at an elevation of 5,000 feet, and the contractor determined the appropriate derating factor for the trucks, from the manufacturers literature, to be 8%. The haul road has an uphill grade of 4% for the first 3,000 feet and a downhill grade of 2% for the last 3,000 feet when traveling from the river to the project site. The rolling resistance of the haul road is estimated to be 120 pounds per ton, and the coefficient of traction is estimated to be 0.4. Job conditions at both the load and dump site are considered average. a. What is the estimated productivity of one dump truck in loose cubic yards per hour, if the contractors operational efficiency is about 45 minutes per hour and the trucks do not wait in a queue to be loaded? b. How many dump trucks should the contractor use to maximize fleet productivity, if he uses one clamshell? c. What is the estimated fleet productivity in loose cubic yards per hour, if the contractor uses the number of trucks selected in b above?

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