Small bumblebee type colony in dead wood pile. How do I move them to clean up under the wood pile? I do not want to destroy them and am willing to wait tforproper time to clean up. When they are hibernating? Now? In Spring? Do I try to preserve the rotting wood sections?
Wait for several hard freezes. When weather gets cold, the workers die and the queen leaves the hive to overwinter elsewhere. She's start a new hive next spring in a new location. (This probably good sanitation to prevent diseases in the hive.)
Here's more about bumble bees: https://extension.umd.edu/hgic/topics/bumble-bees
Even if your bees are not bumblebees, the species will not overwinter in the wood pile, so follow the advice above.
Here's more about other bees and pollinators you might find interesting: https://extension.umd.edu/hgic/topics/how-attract-and-conserve-pollinators-and-natural-enemies-your-...
We're glad to hear you are being so conscientious about our valuable bees.