Problem:
An earth dam being constructed will have a compacted volume of 3 million cubic yards when completed. The design specifications call for a compacted dry unit weight of 135 lb/ft^3 and a moisture content of 12%.
The borrow pit contains material having a specific gravity of 2.75 and a water content of 4%. The degree of saturation in the borrow pit is 23%.
The soil will be transported in highway dump trucks that have a carrying capacity of 30 tons. The water content of the soil being transported in the trucks will drop to 3%. The void ratio of the soil in the trucks will be 0.60.
Required:
Question 1: Determine the volume of soil that needs to be excavated from the borrow pit.
Question 2: Determine the number of truckloads of material required to be hauled.
Question 3: Determine the gallons of water are needed at the dam site to properly compact the soil?
Note: Please provide equation and explain comprehensively and give step by step solution.