What are they doing to my floodplain?

Coming up over the top of the levee, we spotted this. What do they intend to do with the richest dirt found in this area? I'll keep you posted. Meantime, the next frame was our real reason to visit.

July 10, 2006: I never did find out where they took the loam. Additionally, I have seen what I assume are private citizens removing dirt also. Art, a frequent "jogger-by," tells me it used to be common for people to collect loam from the strand. It's self-repenishing, and was probably not illegal back then. Wonder if it is now?