Does the facility conduct leak detection for tanks and piping of all on-site USTs?
Facilities with federally regulated UST systems must conduct leak detection. The monthly monitoring methods that may be used to conduct leak detection of tanks include the following: • Automatic tank gauging: This method uses automated processes to monitor product level and inventory control in the tank. • Statistical inventory reconciliation: A trained professional conducts a statistical analysis of inventory, delivery and dispensing data, which the facility must provide on a regular basis. • Secondary containment and interstitial monitoring: This method monitors interstitial space between containment barriers (for example, a double walled tank). • Vapor Monitoring: This method samples vapors in the soil surrounding the UST. Leaked petroleum produces vapors that can be detected in the soil gas. • Groundwater monitoring: This method monitors the groundwater table near an UST for the presence of released product into the water table. • Other methods approved by the regulatory authority.
