This afternoon while looking into some temperature issues at EY, I found a large puddle of glycol  on the roof of the air handler room near the make up tank and on the floor. I traced this back to a PRV that has failed open. The PRV is on the non potable water line which is tied into the glycol return line from the chillers. 
This appears to be some type of auto fill system that was not used and probably has never worked. Not even sure why it was tied into this system.
Anyway, I valved the PRV off and refilled the glycol lines back to normal operating pressure,~30 psi. 
At this point, I do not intend to replace the PRV because we will not use that system for auto fill.