Category 1 Aboveground Storage Tank (AST) must also have 10-year inspections which may include tightness testing.  

10.3.1. Scheduling

Your fuel tank maintenance company should begin scheduling the test 3 months in advance.  

10.3.2. Inspection

Ten (10) Year Test is not required if AST is entirely aboveground, such as on racks, cradles or stilts or ASTs containing only No. 5 or 6 fuel oil.