Assuming 20 feet by 40 feet, 20x40x4 = 3200 cu ft = 3200/27 = 120 yards = 320,000 pounds
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cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1 foot by 36 sq feet = 36 cubic feet of dirt is needed
You are mixing volume (square yard) and area (length x width). How deep do you want the dirt? One foot deep you need about 80 square yards of dirt.
There is NO dirt, it is a hole! If you want to fill it with dirt, that is 4x6x12=288 cubic feet, weighing about 28,800 pounds
6,400 ft3