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Here's a perfect example - today we removed three trees from a clients yard for transplanting at another site. After the over-excavation needed to get a good rootball, we removed the trees (with rootball). Roughly 16-20" diameter, 12-16" deep (varied by tree).
Even with the soil that came out with the tree, when we pushed the over-excavated loose soils back into the hole, there was a mound where the hole used to be - there was "too much" soil.
That's the "fluff factor" discussed above - in time those soils will settle. But as Dan mentioned, if it's a simple topdressing, that doesn't really apply.
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