The following planned figures for a trenching job are available: The amount of excavation is 100,000 cubic yards. The resource hours and cost are shown in Table P5.1.

At a particular time during the construction, the site manager realizes that the actual excavation will be in the range of 110,000 cu yd. Based on the new quantity, he figures that he will have 30,000 cu yd left.

From the main office, the following job information is available (Table P5.2):
What would concern you as manager of this job?

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TABLE P5.1 Project Effort and Costs Resources (hours) Machines 1000 Labor 5000 Trucks 2000 Cost $100,000 $100,000 $62,500