UST Tank Installation & Closure Procedures

Question 1

Before installing a new UST system, what must an owner/operator notify the implementing agency at minimum?

Accepted Answer

30 days before installation begins

Answer

EPA regulations require owners/operators to notify the implementing agency at least 30 days prior to installing a new UST system.

Question 2

Which backfill material is most commonly required around a steel UST tank to prevent corrosion and provide structural support?

Accepted Answer

Pea gravel or crushed stone (3/4 inch or less)

Answer

Pea gravel or clean crushed stone (3/4 inch or smaller) is the standard backfill because it is non-corrosive, drains well, and provides uniform support around the tank.

Question 3

What is the minimum depth of cover (burial depth) typically required over the top of a UST tank?

Accepted Answer

24 inches

Answer

Most codes and manufacturer specifications require a minimum of 24 inches (2 feet) of cover over the top of the tank to protect it from surface loads and frost.

Question 4

When installing a fiberglass-reinforced plastic (FRP) UST, which of the following installation requirements is unique compared to steel tanks?

Accepted Answer

FRP tanks require anchor straps when high groundwater is anticipated

Answer

FRP tanks are buoyant and must be anchored with anchor straps or deadman anchors when high groundwater conditions exist to prevent flotation.

Question 5

During a UST installation, a vacuum or pressure test is typically conducted to verify what condition?

Accepted Answer

Tank structural integrity and tightness

Answer

Vacuum or pressure testing of the tank and piping before backfilling confirms structural integrity and that the system has no leaks.

(UST) Underground Storage Tank Certification Practice Test

(UST) Underground Storage Tank Certification Practice Test

UST Tank Installation & Closure Procedures