Well, contractually , when excavating, the difference between rock and a stone is that rock needs to be excavated with a particular technique and a anything other than rock, ie a stone or smaller, is less than 1/2 cum. and so can be carried away after being dug out.
I suppose that holds true with tree work. You can leave the twigs on the ground but the branches need to be removed ( or mulched) or the work would be unfinished. Not that all tree workers seem to get that idea.
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