This just happened an hour ago!

The cooling tower on top of the boiler room (part of a Trane RTHA255 chiller system) is spraying a huge continuous mist of liquid and there are gallons of water pouring off the roof. We called our maintenance guy and he are sending someone but can anyone tell me:

Are there chemicals in the water that we need to worry about?
Is the mist spraying out of the cooling tower toxic?

We live only feet away from this thing so please let us know if we need to evacuate!

Thanks!