Sources of leaks include:

• Opening the door before all PERC vapors are removed
• Leaking door, seals, and gaskets
• Evaporation from removed clothing or during cleaning procedures of PERC control devices
• Incomplete separation of PERC vapors from air and water streams before they are released to the environment
• Vaporization of PERC liquid spilt on soil or mixed in water

Control measures include:

• Scheduled maintenance to check for appropriate temperatures of operations
• Checking for leaks by feeling for vapor releases or the use of a chlorinated compound detector (pictured right)
• Use of carbon adsorbers that should be reactivated or replaced when necessary
• Switching to a closed loop model
• Installing Local Exhaust Ventilation (LEV) to reduce PERC levels in areas suspected to be an area of high PERC release
• Using personal protective equipment when performing maintenance activities where exposure is possible