In 2015, EPA revised the underground storage tank (UST) regulations. Below you will find the requirements for tank lining.
The interior of a structurally sound tank may be lined with a thick layer of noncorrodible material to meet the 1998 corrosion protection upgrade requirements. The lining material and application method must comply with applicable industry codes. The lining used must also meet the same federal requirements as for repaired tanks (40 CFR 280.33). Note: Flexible inner liners (bladders) that fit inside a tank do not meet the tank interior lining requirements.
Tanks using only an interior lining for corrosion protection must pass an internal inspection within 10 years and every 5 years after that to make sure that the tank and lining are sound. You should keep records of these inspection results.
2015 Requirement: After October 13, 2015, a tank internally lined to meet the corrosion protection requirement that does not pass the internal lining inspection and cannot be repaired according to a code of practice developed by a nationally recognized association or independent testing laboratory must be permanently closed.
If a tank is internally lined for reasons other than meeting the corrosion protection requirements (such as for compatibility), the periodic inspections of the internal lining are not required.