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Table 4—Visual and Non-Destructive Container Shell Inspections <br /> Container* (Tank Type Volume(gallons) Contents Inspection <br /> Category) Frequency* <br /> T-1 (I) F 12,000 Avgas M,A, E(20) <br /> Drums P 55 Various M <br /> Note <br /> F—Fixed tank; P—Portable Container;M—Monthly;A—Annual;E—External Inspection(every 20 years) <br /> *:Monthly and annual frequency refers to visual inspections by facility personnel and external and internal <br /> inspections are required to be conducted by a certified inspector. <br />