Page 1 of 70
ICC U2 UST Decommissioning MOST TESTED Actual Exam
Questions and Answers 2026 GRADED TO PASS!!!
1. Choose the reasons that a closure in place would be preferred over a removal.
A. Because of the tank location, adjacent equipment or structures may be damaged or weakened if the tank
is removed.
B. It would do a lot of damage to the clients lawn
C. Removal is impossible
D. There is no equipment that is capable of removing the tank
E. Removal may incur excessive costs
Answer A, C, E
2. You should remove all stored liquid and ballast the tank by filin git with water when high _____________
levels occur
________________
Answer Water
3. When temporarily putting a tank out of service what lines should be left open.
______________ ____________
Vent Lines
4. Lead compounds and other residues in the tank may be classified as_____________ waste.
A. Collective
B. Controllable
C. Hazardous
D. Corrosive
Answer C
5. Remove liquids and residues from the tank by using ______________ _____________ or air driven
pumps.
A. Safety Reg
B. Explosion Proof
C.
Answer B
, Page 2 of 70
6. If a vacuum truck is used for removal of liquids and residues it should be positioned up _____________
wind of the tank.
A. Road
B. Mistral
C. Wind
D. B and C
Answer C
7. When filling a tank with sand for a closure in place a nominal amount of water should be used. Why
_______________________________________________________________________________
_______________________________________________________________________________
8. Almost a complete filling of the tank can be achieved by filing it with a combination of sand and
________________
A. Crushed Rock
B. Cachinnate
C. Yerk
D. Earth
Answer D
9. When under ground tanks are disposed in place the owner of the tank should keep a permanent record of
the tank location, the date of disposal in place, and the method of conditioning the tank for disposal.
Why ____________________________________________________________________________
10. To remove the tank of vapors remove the fill pipe, gauge pipe, vapor recovery truck connection,
submersible pumps, and other tank fixtures.
26. Vent all vapors from the tank at a minimum height of 12 feet above grade and 3 feet about any adjacent
roof lines until the tank is purged of flammable vapors.
________ feet ________ Feet
11. When purging a tank of gasses the area should be kept free of gases by using ventilation, specifically
an _______________ type air mover.
A. Teacher
B. Osculate
C. Educator
D. Cantankerous
Answer C
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12. Fill (drop) tubes must be removed to allow proper _________________ of the air in the tank.
A. Lugubrious
B. Debauchery
C. Farrago
D. Diffusion
Answer D
13. What is the safest and simplest methods for vapor-freeing a tank.
_____________________
Answer by adding water.
14. When using water for vapor freeing what is one reason that this method may become prohibited.
A. The high cost of water
B. Treatment/disposal
C. Transportation of the water
D. All of the above
Answer B
15. During the prossess of water filling a tank exessive amounts of flammable vapors will be expleed
throught the fill opping. What is one way to temporarily minimize the escape.
A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
Answer A
16. Steam can be used to clean and vapor-free a tank. However, a large ___________ _______________
can build up on the nozzle of the steam jet. This can make steam cleaning dangerouse and if other meathoses
are avalable steam purging should be avoided.
A. Explosive detonation
B.
17. The tank atmosphere and the excavation area should be regularly tested why. for flammable or
combustible vapor
Answer
For flammable or combustible vapor
, Page 4 of 70
18. What device should be used to test the tank
Combustible gas indicator probe into the fill opening at the bottom
35. Readings ______% or less of the lower flammable limit must be obtained before the tank is considered
safe for removal from the ground.
20%
Answer
19. Thanks should be labeled after removal from the ground but prior to removal from the ______________
A. Site
B. Abnegation
C. Cleve
D. None of the above
Answer A
20. Warning of certain types of reuse. The former content and present vapor state of each tank including
vapor-freezing treatment and date should be written on the tank in _____ inch high lettering.
A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
Answer B
23. Tanks that once where declared clean of fule oil could still again some time later show sighnes of
containing fule oil.
True/ False
True
24. Tanks should be tested for flammable liquids before they are _____________.
A. Denigrated
B. Dispelled
C. Transported
D. A and B
Answer C
25. What are the three things that must be present in order for the fire triangle to work
ICC U2 UST Decommissioning MOST TESTED Actual Exam
Questions and Answers 2026 GRADED TO PASS!!!
1. Choose the reasons that a closure in place would be preferred over a removal.
A. Because of the tank location, adjacent equipment or structures may be damaged or weakened if the tank
is removed.
B. It would do a lot of damage to the clients lawn
C. Removal is impossible
D. There is no equipment that is capable of removing the tank
E. Removal may incur excessive costs
Answer A, C, E
2. You should remove all stored liquid and ballast the tank by filin git with water when high _____________
levels occur
________________
Answer Water
3. When temporarily putting a tank out of service what lines should be left open.
______________ ____________
Vent Lines
4. Lead compounds and other residues in the tank may be classified as_____________ waste.
A. Collective
B. Controllable
C. Hazardous
D. Corrosive
Answer C
5. Remove liquids and residues from the tank by using ______________ _____________ or air driven
pumps.
A. Safety Reg
B. Explosion Proof
C.
Answer B
, Page 2 of 70
6. If a vacuum truck is used for removal of liquids and residues it should be positioned up _____________
wind of the tank.
A. Road
B. Mistral
C. Wind
D. B and C
Answer C
7. When filling a tank with sand for a closure in place a nominal amount of water should be used. Why
_______________________________________________________________________________
_______________________________________________________________________________
8. Almost a complete filling of the tank can be achieved by filing it with a combination of sand and
________________
A. Crushed Rock
B. Cachinnate
C. Yerk
D. Earth
Answer D
9. When under ground tanks are disposed in place the owner of the tank should keep a permanent record of
the tank location, the date of disposal in place, and the method of conditioning the tank for disposal.
Why ____________________________________________________________________________
10. To remove the tank of vapors remove the fill pipe, gauge pipe, vapor recovery truck connection,
submersible pumps, and other tank fixtures.
26. Vent all vapors from the tank at a minimum height of 12 feet above grade and 3 feet about any adjacent
roof lines until the tank is purged of flammable vapors.
________ feet ________ Feet
11. When purging a tank of gasses the area should be kept free of gases by using ventilation, specifically
an _______________ type air mover.
A. Teacher
B. Osculate
C. Educator
D. Cantankerous
Answer C
, Page 3 of 70
12. Fill (drop) tubes must be removed to allow proper _________________ of the air in the tank.
A. Lugubrious
B. Debauchery
C. Farrago
D. Diffusion
Answer D
13. What is the safest and simplest methods for vapor-freeing a tank.
_____________________
Answer by adding water.
14. When using water for vapor freeing what is one reason that this method may become prohibited.
A. The high cost of water
B. Treatment/disposal
C. Transportation of the water
D. All of the above
Answer B
15. During the prossess of water filling a tank exessive amounts of flammable vapors will be expleed
throught the fill opping. What is one way to temporarily minimize the escape.
A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
Answer A
16. Steam can be used to clean and vapor-free a tank. However, a large ___________ _______________
can build up on the nozzle of the steam jet. This can make steam cleaning dangerouse and if other meathoses
are avalable steam purging should be avoided.
A. Explosive detonation
B.
17. The tank atmosphere and the excavation area should be regularly tested why. for flammable or
combustible vapor
Answer
For flammable or combustible vapor
, Page 4 of 70
18. What device should be used to test the tank
Combustible gas indicator probe into the fill opening at the bottom
35. Readings ______% or less of the lower flammable limit must be obtained before the tank is considered
safe for removal from the ground.
20%
Answer
19. Thanks should be labeled after removal from the ground but prior to removal from the ______________
A. Site
B. Abnegation
C. Cleve
D. None of the above
Answer A
20. Warning of certain types of reuse. The former content and present vapor state of each tank including
vapor-freezing treatment and date should be written on the tank in _____ inch high lettering.
A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
Answer B
23. Tanks that once where declared clean of fule oil could still again some time later show sighnes of
containing fule oil.
True/ False
True
24. Tanks should be tested for flammable liquids before they are _____________.
A. Denigrated
B. Dispelled
C. Transported
D. A and B
Answer C
25. What are the three things that must be present in order for the fire triangle to work
