Sand worms?

Earth worms usually don't live in sand. It is hard to penetrate, has no nutrients and loose moisture easily.
So how did all those worms get into a sandbox in a local park in Kirkland?
I think they just got trapped there during one of their spring travels.
They usually get stuck in the sand the same way as a bicycle. The sand adheres to their mucus and virtually immobilizes them. With the sunrise the worms in sand dry out and die.
The same observation I found in Darwin's book
"The Formation of Vegetable Mould through the action of worms with observations of their habits." (Search for "Hyde Park".)
Darwin claims that those worms are sick,
but I don't think so, since the worms from the last year lived 6 months in my bin after being rescued from the sand.
This time I washed them and took some pictures.
I think there are several species of worms. Please help me to identify them.
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