they have a leak in the basement--in a storage area--or somewhere else where chemicals are stored in the building or a nearby building (more uses for acetone in biology than oil well drilling).
...someone is dumping chemicals into the sewers and the fumes are backing up into the building...
...there is a chemical dump nearby leaking (Love Canal stuff)
...or there is a drug lab in the neighborhood.
Just my guesses.
I have never been on a drilling location (and I have worked on hundreds of them) where acetone was used.
Ding ding ding!
One more guess.
An environmental terrorist is bombing their place with chemicals in order to stop the fracking and oil recovery.