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Industry Standard Requirements for Tank Inspection Frequency For the sake of consistency,the standard for testing frequency for ConVault fuel and oil containment systems should be consistent with the requirements of STI SP001 which is detailed below and is normally a function of the size of the tank and its Category per SP007 Standard. Tank Categories The tank categories and inspection schedule from SP001 are to be utilized for ConVault tanks. Among other factors,owners should take a number of aspects into consideration such as the tank leak detection system,and that the monitoring equipment is in good working condition. Based on many considerations,the SPo01 standard classifies tanks into three categories.Depending on the risk a tank system poses to the environment if kept in service it is ranked as a category 1,2 or 3 tank.Category 1 tanks pose the least amount of risk and category 3 the highest. See Table 5.4 of the standard,reproduced here,for examples of tank configuration and AST category.Please note that if the AST bottom plate, other than its legs or supports, is in contact with the ground or a concrete slab, it is prone to corrosion and increased susceptibility to leakage. Shop Fabricated Tanks in contact with the ground or a concrete base are almost always vertical tanks. Such tanks are placed in Category 2 or 3.ASTs which are elevated,have a leak detection system, have spill control and have no part of the tank in contact with the ground(other than legs or supports)are classified as category 1 tanks. Table SA:Example Tank Configurations and AST Category Tank Configuration Tank has CRDM AST Category AST Incontactwithground No 2or3 ConVault P Pevated tank w/spill control&no part of AST in contact w/ground Yes 1 Vertical tan kw/RPB&spit ccontrol Yes 1 Vertical tank w/double bottom&spill control Yes 1 Double-wall AST Yes 1 AST w/secondary containment dike/berm � Yes 1 CRDM.-Continuous Release Detection Method—or Leak Detection System RPB:Release Prevention Barrier Inspection Type and Frequency The SP0001 standard requires different inspection types and different inspection intervals based on the tank size, tank category,and the risk it poses.The tank inspection intervals from SP001 are to be followed for ConVault tanks. In Table 5.5 of SP0001 (see next page),those portions pertaining to shop fabricated tanks up to 30,000 gallons have been highlighted showing inspection schedules for the different AST categories.