Release Detection & Prevention Flashcards

Which of the following is NOT a method approved by EPA for release detection on underground storage tanks?

Answer: Manual tank gauging for tanks over 2,000 gallons

Manual tank gauging is only approved as a sole method for tanks of 2,000 gallons or less; larger tanks require it to be combined with another method.

A sump sensor in a dispenser containment sump triggers an alert. What is the FIRST action the operator should take?

Answer: Investigate the source of the alarm immediately and shut down the dispenser if a release is confirmed

Any sensor alarm indicating product in a containment sump must be investigated immediately; if a release is confirmed, dispensing must be stopped to prevent further contamination.

When must an operator switch from manual tank gauging (used alone on tanks ≤2,000 gallons) to another form of release detection?

Answer: When the tank capacity is increased above 2,000 gallons

If a tank's capacity is expanded or a new tank over 2,000 gallons is installed, manual tank gauging alone is no longer an approved standalone release detection method.

Overfill prevention equipment is required on USTs that receive product deliveries of more than how many gallons at one time?

Answer: 500 gallons

EPA requires overfill protection on tanks receiving deliveries greater than 25 gallons (some states use 500 gallons as a common practical threshold), but check state rules; the federal trigger is any delivery.

What is the purpose of a 'line tightness test' on underground piping?

Answer: To verify that piping does not leak product into the environment

A line tightness test pressurizes the piping and checks for pressure decay to confirm that no product is escaping into the surrounding soil or groundwater.

Which of the following scenarios best illustrates a 'release prevention' measure rather than a 'release detection' measure?

Answer: Installing spill buckets at fill ports to catch delivery spills

Spill buckets are prevention equipment designed to catch spilled product before it reaches the environment, while ATG, vapor monitoring, and inventory reconciliation are detection methods.

Under EPA regulations, how long must records of ATG system performance tests be retained?

Answer: 3 years

EPA requires performance testing records for release detection equipment, including ATG systems, to be kept for at least 3 years.