Practice question

Why can an empty cargo tank that last carried hazmat still require placards?

  1. Residue can remain and the tank may still be regulated as containing hazmat residue
  2. Empty tanks are always unregulated immediately
  3. Placards are required only to advertise the carrier
  4. Residue means the tank was steam cleaned

Answer: A — Residue can remain and the tank may still be regulated as containing hazmat residue

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