The Sink continued to ruthlessly scrub any particulate matter that came near it. Once it learned of the Innovative Toxins Plant, however, it gained new purpose. It sought to develop anti-toxins to flush into its drains and counteract the poisons bleeding into the soil.
When you enter the facility for the first time, you will be attacked by several Y-17 trauma harnesses. If you have the Wild Wasteland Trait, one of them will say, "Hey, who turned out the lights?" This is a reference to the Doctor Who episodes Silence in the Library and Forest of the Dead.
This facility appears to have been the original development source for the toxic red haze known as the Cloud, which appeared in Dead Money.