A contractor has a contract for the construction of a shopping center with full basement, located in

A contractor has a contract for the construction of a shopping center with full basement, located in a residential area, and must use on-highway trucks to transport the material to be excavated for the buildings basement and foundation. To transport the excavated material, the contractor has decided to use 30-cubic-yard side-dump haulers similar to the one shown in Figure 12.6. The size of the excavation required is 400 feet long, 180 feet wide, and 28 feet deep. To excavate the soil and load the trucks, the contractor has decided to use a tracked hydraulic backhoe excavator with a 4-cubic-

A contractor has a contract for the construction of a shopping center with full basement, located in a residential area, and must use on-highway trucks to transport the material to be excavated for the buildings basement and foundation. To transport the excavated material, the contractor has decided to use 30-cubic-yard side-dump haulers similar to the one shown in Figure 12.6. The size of the excavation required is 400 feet long, 180 feet wide, and 28 feet deep. To excavate the soil and load the trucks, the contractor has decided to use a tracked hydraulic backhoe excavator with a 4-cubic-yard bucket. Job conditions at the jobsite and at the dump site are considered to be average. The cycle time for the excavator is estimated to be 25 seconds. The spotting time for the hauler is estimated to be 0.5 minutes, and the turn and dump time is estimated to be 0.7 minutes. Because of the necessity to travel on city streets, the estimated travel time for the haulers is 40 minutes. The material to be excavated is a rockdirt mixture weighing 3,250 pounds per bank cubic yard with a swell of 18%. Operational efficiency is estimated to be 50 minutes per hour. The hourly ownership, operating, and labor cost for the hauler is $175, and the hourly ownership, operating, and labor cost for the excavator is $280. a. What is the estimated production rate of one hauler in bank cubic yards per hour, if the hauler does not wait in a queue to be loaded? b. How many haulers should be used by the contractor to minimize the cost of excavating for the basement and foundation? c. What is the estimated unit cost in dollars per bank cubic yard to excavate for the basement and foundation and haul the material to the dump site?

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