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Division of Waste Management
Underground Storage Tank Branch

Operational Compliance
Operational Maintenance Requirements

Leak Detection
A minimum of one of the following leak detection methods is required for all underground storage tank (UST) systems that are active or in temporary closure:
  • Automatic tank gauging (ATG) - monitoring both tanks and piping or tanks alone
  • Interstitial monitoring and secondary containment (IMC) - monitoring for double-walled tanks and double-walled piping
  • Statistical inventory reconciliation (SIR) - automated or manual recordkeeping for tanks and piping
  • Periodic tank tightness testing (TTT) - can only be used for up to 10 years after installation, at which time another monthly method of monitoring must be chosen
  • Manual tank gauging (MTG) - monitoring only for tanks which are 2,000 gallons or less
  • Vapor or groundwater monitoring

Leak detection options for pressurized piping:

  • Automatic line leak detector with annual operational test and annual line tightness testing or
  • Monthly monitoring (i.e., electronic line leak detectors (ELLD), SIR, interstitial monitoring, etc.)

Leak detection options for suction piping:

  • Line tightness testing every three years or
  • No leak detection required for suction piping if the piping system operates at less than atmospheric pressure, slopes back to tank and has a check valve directly below the dispenser; evidence of this type of installation must be submitted to the UST Branch Compliance Section

Spill and Overfill Prevention
All active UST systems must have spill prevention such as a catchment basin and overfill prevention such as an alarm or shut-off valve.

Corrosion Protection
All tanks and piping must have corrosion protection, most of which require periodic testing. Corrosion protection options include the following:

  • Impressed current protection with testing every three years and 60-day logs
  • Galvanic cathodic protection with testing every three years (StiP3 and field installed)
  • Internal lining (tank only) with testing 10 years after installation and every five years thereafter
  • Using noncorrosive materials such as "jacketed" tanks, fiberglass (tanks or piping), or flexible piping
  • Isolation is a valid form of protection in the case of flex connectors

Persons conducting corrosion protection testing must meet certain minimum qualifications. To obtain additional information please contact the UST Branch Compliance Section.