- New UST systems must include:
- liquid tight under-dispenser containment sumps with sensors, and
- liquid tight piping containment sumps with sensors.
- The requirements for new under-dispenser containment must be met when:
- replacing more than fifty (50) percent of the dispensers at a facility, the requirements for new under-dispenser containment sumps must be met for all dispensers at the facility or
- replacing a dispenser and more than fifty (50) percent of the flex-joint or flexible piping that is directly beneath the dispenser.
- Upon installation and prior to operating any newly installed double-walled UST system:
- testing must be performed which demonstrates that liquids which accumulate in any part of the UST system (including sumps) will not be released to the environment, and
- re-tests will be required every five (5) years thereafter, although this requirement does not apply to certain secondary containment systems that are hydrostatically or vacuum monitored continuously.
- Under-dispenser containment sumps and piping containment sumps that require repairs must be tested to demonstrate that the repaired sump meets the requirements of a new under-dispenser containment sump or new piping containment sump.
Content last updated September 2019