On page 80 (Water Tanks) there is a reference to random encounters, but as far as I can tell, no tables for such are provided in the module. Is the expectation that dungeon masters will create and populate their own tables?

On further readings, every zone in the living quarters has a random encounter table! As far as I can tell, it's only this floor that has them though, so GMs may still want to make their own for tge other floors if they so choose.