Tank system means a hazardous waste storage or treatment tank and its associated ancillary equipment and containment system.
Underground storage tank system means an underground storage tank and the connected underground piping, underground ancillary equipment, and containment system, if any.
Storage tank means an aboveground storage tank or underground storage tank as defined by this Regulation.
Unfit-for-use tank system means a tank system that has been determined through an integrity assessment or other inspection to be no longer capable of storing or treating hazardous waste without posing a threat of release of hazardous waste to the environment.
New tank system means a tank system that will be used to contain an accumulation of regulated substances and for which installation has commenced after January 14, 1987. (See also “Existing Tank System.”)