[Erasmus]

There's really nothing wrong with O.P.'s numbers if you assume that the excavator has to raise the dirt one foot.

I am wondering though whether the terms of the competition spelled out that the weight of the dirt would be in terms of Earth gravity or Moon gravity.

Coulda been a big loophole to exploit, as in: "You had to mean the mass of 330 pounds on Earth; well, that really weighs only 55 pounds on the moon, so that's what we built our scooper to do."

[Shuttle Shucker]

That’s an interesting loophole that you suggested :-)