Ok, what can you do to the lake bottom?

[mishman]

Watched an excavator on a barge dredge a deeper channel for a boat to get to his dock today. Created all kinds of silt (no silt barriers in place). When the barge left with heaps of bottom sand/sludge on its deck, when he got out to deep water he dumped it by using the shovel to side swap it off the deck. Took fifteen or twenty swipes so it was very noticeable.

So the question is, is this really legal? Assume they had a permit to dig a deeper channel but no silt barriers? And to dump in a deep spot in the lake. Just seemed like it was a 1950s thing to do. But I could be wrong. This is, after all, New Hampshire.