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It's done very rarely at UMass- it rains about 130 days out of the year here, so there's a fairly good chance that it'll either get washed away, or that the sidewalk will be too wet.
We've had it banned on buildings- we've had the problem that some of our buildings (especially the Fine Arts Center) are made of materials that take in the chalk, and they have to be sandblasted to remove it.
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