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A Trench
That's not enough information. You need to know the width of the trench, and how much volume 1 ton of gravel is equivalent to.
volume of trench = 10' x 3' x 54' = 1620 cubic feet therefore 1620 cubic feet of concrete will be required.
The depth is less important than the proper shoring up of the trench sides. Even a shallow trench can collapse and trap a worker if the sides are not shored up properly.
The tench shape was in a zig-zag shape, it was never in a straight line