If your UST system, or any part of it, is protected by either sacrificial anodes or an impressed current system, the cathodic protection system must be tested at least every three years to make sure it is functioning properly. The required tests can be conducted by a qualified cathodic protection tester who will take soil potential readings, as directed by DEQ, and provide the tank owner with the results. The results should be kept at the facility.
Line Tightness Testing
A periodic test of piping may be conducted only if it can detect a 0.1 gallon per hour leak rate at 1.5 times the operating pressure.
Tank Tightness Testing
Tank tightness testing must be capable of detecting a 0.1 gallon per hour leak rate from any portion of the tank that routinely contains product while accounting for the effects of thermal expansion or contraction of the product, vapor pockets, tank deformation, evaporation or condensation, and the location of the water table.