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Is there any kind of frequency to these occurrences? Do they happen every x minutes? If yes maybe you could tie it to some piece of equipment in the building cycling on/off.
If you can't go into other parts of the building do they happen to have any plumbing drawings you could look at? How long has this problem existed?
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)