UST: WV Underground Install and
Repair Questions and Correct
Answers 2025-2026 Updated.
What is the proper way to move a tank? - Answer Lifting Lugs
When two lifting lugs are used, the angle between the lifting cable and vertical should be no
more than_____? - Answer 30 degrees
Before any attempt to move tanks is made, establish that ________ has sufficient capacity and
reach to life and lower the tanks? - Answer Hoisting
When performing pre-installing tank testing what should be performed? - Answer Soap Test
When performing a pre-installation air test what should be done to prevent over-
pressurization? - Answer Use two gauges, use a pressure relief device
What is the maxium test pressure for tanks less than 12 ft. diameter? - Answer 5 psi
What is the space between the inner and outer tank wall called? - Answer Interstice
A double wall tank is delivered to the site with a vacuum on the interstice. The vacuum gauge
indicates a level below the minimum level set by the manufacturer Who should be contacted? -
Answer Tank Manufacturer
Which of the following factors aggravate excavation problems? - Answer ground water and
surface water, unstable soil, adjacent back filled areas, frost, presence of released product, and
vibration.
Which of the following factors should be considered when determining the slope to be used for
the excavation walls? - Answer soil conditions, depth of the excavation, shoring
requirements, safety considerations
PEI/ RP100 recommends that tanks be set on back fill material at least ------ thick? - Answer 1
foot
PEI/PR100 recommends that at least how much backfill material should be between the tanks? -
Answer 2 feet
,PEI/RP 100 recommends that at least how much backfill material should be between the tanks
and the excavation walls? - Answer 2 feet
Under what conditions are placing a tank directly on a hold-down pad permitted? - Answer
No conditions
Paving over tanks in traffic areas should extend how far beyond the perimeter of the tank
excavation? - Answer 1 foot
PEI/RP100 recommends in areas where fully loaded product transport vehicles are likely to pass
over the tank area. that the reinforced concrete over the tank be at least much thick? - Answer
8 inches
According to the PEI/RP 100-11 how is the maximum burial depth of a tank measured? - Answer
from the top of the tank
According to PEI/Rp100-11 what is the standard maximum burial depth for fiberglass tank? -
Answer 7 feet
According to PEI/RP100-11 what is the maximum burial depth for steel tanks? - Answer 5
feet
How far from the edge of the tank excavation should excavated material that cannot be
immediately removed be stockpiled? - Answer 2 feet
What are common deficiencies that adversely affect the structural integrity and coatings of
tanks? - Answer incorrect backfill, improper placement, rocks or debris, voids under the
lower quadrant of tank failure to prevent migration of backfill materials.
What does PEI/Rp100-11 state are the "standard" backfill materials for fiberglass tanks? -
Answer pea gravel and crushed rock
When installing fiberglass tanks, the bottom of the excavation should be covered by a minimum
of ______ of suitable graded and compacted back fill materials? - Answer 1 foot
According to the PEI/RP100-11 when sand is used as a backfill, what is the recommended
compaction specification? - Answer lifts, compact each one
, Why is measuring the deflection of fiberglass tanks important - Answer Amanda is hot (you
didn't answer this one) ;)
What is the purpose of filter fabric in a tank excavation? - Answer designed to let water pass
through without letting backfill materials to move
For the purposes of calculating tank burial depth, 1 inch of reinforced concrete over the tank is
equivalent to how many inches of compacted back fill? - Answer 1.5
Where must "deadman" anchors be placed to be effective? - Answer Outside diameter of
the tank
What are the minimum dimenstions for a bottom hold down anchorage pad? - Answer 8
inch concrete extended 18 inches beyond tank, and 1 foot beyond each end
When installing a bottom hold down pad what factors must be calculated for each installation? -
Answer thickness of the pad, aount of concrete reinforcement, and the number and size of
anchor points
When should vent restriction devices, often referred to as "ball and float valves" NOT be
installed on a UST system? - Answer Amanda is the best future wife for me (you didn't
answer this one)
What components should a monitoring well contain? - Answer Jerome has a booty (didn't
answer this one)
When sensors are used for elak detection in disenser sumps, where should the sensors be
installed? - Answer Bottom of the sump
Galvanized product piping is allowed on piping containing which product - Answer Gas
What is the minimum distance between product pipes in a trench - Answer 4 inches
what is the minimum distance between the piping and the trench excavation walls? - Answer
6 inches
what is the minimum distance in a piping trench between a conduit and the piping in the
trench? - Answer 6 inches
Repair Questions and Correct
Answers 2025-2026 Updated.
What is the proper way to move a tank? - Answer Lifting Lugs
When two lifting lugs are used, the angle between the lifting cable and vertical should be no
more than_____? - Answer 30 degrees
Before any attempt to move tanks is made, establish that ________ has sufficient capacity and
reach to life and lower the tanks? - Answer Hoisting
When performing pre-installing tank testing what should be performed? - Answer Soap Test
When performing a pre-installation air test what should be done to prevent over-
pressurization? - Answer Use two gauges, use a pressure relief device
What is the maxium test pressure for tanks less than 12 ft. diameter? - Answer 5 psi
What is the space between the inner and outer tank wall called? - Answer Interstice
A double wall tank is delivered to the site with a vacuum on the interstice. The vacuum gauge
indicates a level below the minimum level set by the manufacturer Who should be contacted? -
Answer Tank Manufacturer
Which of the following factors aggravate excavation problems? - Answer ground water and
surface water, unstable soil, adjacent back filled areas, frost, presence of released product, and
vibration.
Which of the following factors should be considered when determining the slope to be used for
the excavation walls? - Answer soil conditions, depth of the excavation, shoring
requirements, safety considerations
PEI/ RP100 recommends that tanks be set on back fill material at least ------ thick? - Answer 1
foot
PEI/PR100 recommends that at least how much backfill material should be between the tanks? -
Answer 2 feet
,PEI/RP 100 recommends that at least how much backfill material should be between the tanks
and the excavation walls? - Answer 2 feet
Under what conditions are placing a tank directly on a hold-down pad permitted? - Answer
No conditions
Paving over tanks in traffic areas should extend how far beyond the perimeter of the tank
excavation? - Answer 1 foot
PEI/RP100 recommends in areas where fully loaded product transport vehicles are likely to pass
over the tank area. that the reinforced concrete over the tank be at least much thick? - Answer
8 inches
According to the PEI/RP 100-11 how is the maximum burial depth of a tank measured? - Answer
from the top of the tank
According to PEI/Rp100-11 what is the standard maximum burial depth for fiberglass tank? -
Answer 7 feet
According to PEI/RP100-11 what is the maximum burial depth for steel tanks? - Answer 5
feet
How far from the edge of the tank excavation should excavated material that cannot be
immediately removed be stockpiled? - Answer 2 feet
What are common deficiencies that adversely affect the structural integrity and coatings of
tanks? - Answer incorrect backfill, improper placement, rocks or debris, voids under the
lower quadrant of tank failure to prevent migration of backfill materials.
What does PEI/Rp100-11 state are the "standard" backfill materials for fiberglass tanks? -
Answer pea gravel and crushed rock
When installing fiberglass tanks, the bottom of the excavation should be covered by a minimum
of ______ of suitable graded and compacted back fill materials? - Answer 1 foot
According to the PEI/RP100-11 when sand is used as a backfill, what is the recommended
compaction specification? - Answer lifts, compact each one
, Why is measuring the deflection of fiberglass tanks important - Answer Amanda is hot (you
didn't answer this one) ;)
What is the purpose of filter fabric in a tank excavation? - Answer designed to let water pass
through without letting backfill materials to move
For the purposes of calculating tank burial depth, 1 inch of reinforced concrete over the tank is
equivalent to how many inches of compacted back fill? - Answer 1.5
Where must "deadman" anchors be placed to be effective? - Answer Outside diameter of
the tank
What are the minimum dimenstions for a bottom hold down anchorage pad? - Answer 8
inch concrete extended 18 inches beyond tank, and 1 foot beyond each end
When installing a bottom hold down pad what factors must be calculated for each installation? -
Answer thickness of the pad, aount of concrete reinforcement, and the number and size of
anchor points
When should vent restriction devices, often referred to as "ball and float valves" NOT be
installed on a UST system? - Answer Amanda is the best future wife for me (you didn't
answer this one)
What components should a monitoring well contain? - Answer Jerome has a booty (didn't
answer this one)
When sensors are used for elak detection in disenser sumps, where should the sensors be
installed? - Answer Bottom of the sump
Galvanized product piping is allowed on piping containing which product - Answer Gas
What is the minimum distance between product pipes in a trench - Answer 4 inches
what is the minimum distance between the piping and the trench excavation walls? - Answer
6 inches
what is the minimum distance in a piping trench between a conduit and the piping in the
trench? - Answer 6 inches
