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User’s Guide for the Federal Identification Registry for Storage Tank Systems

Note on tanks containing more than one product (“compartment tanks”)

For tanks that contain more than one product (“split tanks” or “compartment tanks”) register each compartment as a separate tank within the storage tank system. If the compartment is interconnected with another tank, identify both tanks as part of the same storage tank system.

Use the "system description" and "tank description" boxes in FIRSTS to specify that it is a split tank AND which compartment of the tank is being identified.