An electronic device that can detect the presence of water, liquid product, product vapors or a loss of pressure or vacuum in the interstitial space of a tank, tank top sump, fuel dispenser sump, or observation well.
Have you had an upgrade to your location? Are you having your sensor(s) tested annually?
All new and replacement UST systems (tank, piping, submersible pumps, dispensers) must be secondarily contained with interstitial monitoring.
With these new federal and state regulations, sensor testing is becoming a major part of your required annual testing requirements at your sites.