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Well, here's what I was tentatively thinking. I was thinking that if that cement came from Scott, that it was excess. Perhaps a partly torn bag was thrown down by him. Then I thought maybe the water lapping at the shore made that area just damp enough to possibly turn some of the cement powder into mush. The rest of the powder might have just washed away later. But the "mush" might have been off to one side, and maybe the tire rolled through it. Maybe the water didn't come up to where that part was for a while--long enough for it to dry into a sort of patch.

Or suppose the torn bag of cement was discarded on a damp bank. Suppose there wasn't enough water on the surface to do anything to the powder. But suppose the tire squashed a small portion of the powder into the wet ground on the bank, and that made it wet enough to mix some water with the powder that got pressed into the bank? I guess it would depend on whether the hardened cement was sort of embedded in the wet bank.

I wonder if the cement on the bank wasn't dumped later--to keep police from finding it?

I know it seems ridiculous that he'd be mixing cement there on the bank instead of at his warehouse or home. But hey, if a spot is deemed secluded enough to throw a body in the water... ? Also, he may have felt he had to mix it at the site where he was going to put it in the barrel--maybe he realized just how heavy hardened cement with a body in the barrel would be.

All of the above is only the rankest speculation.