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At facilities regulated by the SPCC rule, all containers, equipment, and areas with the potential for oil discharges are subject to secondary containment requirements. Affected equipment and areas must have “appropriate containment” that is able to contain the most likely quantity of oil that would be discharged until it can be cleaned up. The original containers, equipment, and piping serve as the “primary containment,” while the “secondary containment” serves as “backup” protection against spills, leaks, and primary containment failures. This course describes the secondary containment that can be used to prevent oil discharges.