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STI External Tank Inspection [_ UPRR French Camp Tank No.TNKD-0829 Antea Group Project No. UP03061T a ntea'g ro u p 2.5 INSPECTION INTERVAL NEXT FORMAL EXTERNAL INSPECTION (FEI) INTERVAL Formal external inspection interval as determined from STI SP001 standards shall not exceed 20 years. Formal external inspection due before 1/29/2039. NEXT FORMAL INTERNAL INSPECTION (FII) INTERVAL Due to the size and AST Category of the tank and the spill control, no Formal Internal Inspection interval was conducted in accordance with STI-SP001. 2.6 DEFINITIONS Continuous Release Detection Method (CRDM) - A means of detecting a release of liquid through inherent design. CRDM is passive because it does not require sensors or power to operate. Liquid releases are visually detected by facility operators.The system shall be designed in accordance with good engineering practice. Several acceptable and commonly used CRDM systems are as follows: • Release prevention barrier(RPB) (described in definition of release prevention barrier). • Secondary containment AST, including double-wall AST or double-bottom AST. • Elevated AST,with or without release prevention barrier. Release Prevention Barrier (RPB) - A liquid containment barrier that is installed under the AST. Its purpose is to divert leaks toward the perimeter of the AST where they can be easily detected,as well as to prevent liquid from contaminating the environment. RPBs are composed of materials compatible with the liquid stored in the AST and meet appropriate engineering standards. Examples are steel (as in steel double bottom tanks), concrete,elastomeric liners or other suitable materials, provided the above criteria are met. Category 1(AST)-The AST shall be repaired or replace if more than 3 square inches of any one square foot of the tank shell (i.e. approximately 2%) is found to be less than 50%of the original shell thickness or if the remaining shell thickness of an area is less than 25%of the original shell thickness at any point. XIINOGEN� 9 us_anteagroup.com