apparently the wall street journal covered this. from straightdope.com:
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Dear Randy:
The article reports on the work of New York state wildlife expert Richard Thomas, who found that a woodchuck could (and does) chuck around 35 cubic feet of dirt in the course of digging a burrow. Thomas reasoned that if a woodchuck could chuck wood, he would chuck an amount equivalent to the weight of the dirt, or 700 pounds. We are pleased to know this, of course. But it sure isn't easy to fit into a snappy verse.>>