the tank is inspected before the installation of cathodic protection and found to be structurally sound and free of corrosion holes; |
the tank has been installed for less than 10 years and been monitored monthly for leaks; |
the tank has been installed for less than 10 years and is found to be free of corrosion holes by conducting 2 tightness tests. The first test must be conducted before installing cathodic protection and the second must be conducted 3 to 6 months following the first operation of the cathodic system; |
the tank is found to be free of corrosion holes by another method approved by the implementing agency. |