Kenton County Parks Underground water leak

Kenton County Parks called regarding an underground water leak adjacent to some restrooms at Mils Road Park. This was another case of not being able to isolate the system as the 2″ copper water service had a reduced pressure backflow preventer on it, which would not allow adding compressed air or helium into the system. Wet listening was performed everywhere and no noise peaks were found in the vicinity of the restrooms. There was a loud humming which we determined was coming from a transformer in the mechanical room. Once that was turned off the hum was silenced. The water was tested and found to be potable water, so since we didn’t have a leak at the restrooms, we looked for other sources. It turned out that a 36″ water main at the street 40ft away had a leak the week before and was repaired the prior Friday. Upon checking the line there was a 20 decibel peak right above the repair location as compared to the line readings 10ft away in either direction. This seemed to indicate that the repair may not have been entirely successful. Kenton County Parks passed on the info to Northern Kentucky water district to have the underground water leak repaired.