An Owner of an underground storage tank (UST) system is required to notify the Alaska Department of Environmental
Conservation (ADEC) for any UST system installed or in service, Taken Out-Of-Service or Temporarily Closed, in accordance with Title 18 Alaska Administrative Code (AAC) Underground Storage Tanks. “Taken Out-Of-Service" means a tank is empty, vented and secured. "Temporary Closure" means a UST system may contain petroleum product but is not currently in use (but may not be kept in this status for longer than three months).
A UST system in Taken Out-of-Service (TOS) status must not contain more than one inch (2.5 centimeters) of petroleum. A UST system in Temporary Closure (TC) status that may contain free petroleum product is not permitted be in TC status for more than three months. A UST system that does not meet regulatory and industry standards is not permitted to be out-of-service for more than 12 months before permanent closure is required.