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■ Choice 1 - Periodic AST inspections by the owner are necessary. Also, Formal External Inspections by a certified inspector and leak tests by owner or owner's designee are necessary at 5 year intervals. Lastly, Formal Internal Inspections by certified inspector are necessary at 10 year intervals. ■ Choice l - Periodic AST inspections by the owner are necessary. Also, leak tests by owner or owner's designee are necessary at 1 year intervals. Lastly, Formal External Inspections by certified inspector are necessary at 5 year intervals. Notice that two inspection alternatives or owner choices of types of inspections are given. STI SP001 provides alternatives where warranted in an effort to equalize the risks associated with each alternative. In this case, these two choices were given because entering an AST poses significant risk to the inspector. Also, many shop -fabricated ASTs do not have manways and therefore entry is difficult. Noted though is the fact that Formal Internal Inspections provide more information about the condition of an AST than Formal External Inspections combined with leak tests and therefore the former method is provided with longer intervals between inspections than the latter. Hence, if we can reduce the frequency of internal inspection while also maintaining equivalent protection, we can reduce the risk of harm to human health and the environment. To the owner of tanks, reduced inspections by the addition of safeguards is money in their pocket. To the regulator, targeting inspections at the tanks that are installed without safeguards prevents leaks. Implied in Table 5.5 in SPOO 1 is the encouragement for a tank owner to improve a tank installation to reduce its risk to the environment. By applying generally accepted good industry and engineering practices, such as those given for Category 1 tanks, the tank owner is rewarded 10