ICC U2 UST Decommissioning Exam Questions
2025/2026 | Actual Questions and
Answers Verified 100% Correct
1. 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. - ANSWER -A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
ANSWER A
2. 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. - ANSWER -A. Explosive detonation
B.
3. The tank atmosphere and the excavation area should be regularly tested why.
for flammable or combustible vapor - ANSWER -ANSWER
For flammable or combustible vapor
4. What device should be used to test the tank - ANSWER -Combustible gas
indicator probe into the fill opening at the bottom
5. Readings ______% or less of the lower flammable limit must be obtained
before the tank is considered safe for removal from the ground. - ANSWER -20%
ANSWER
6. Thanks should be labeled after removal from the ground but prior to removal
from the ______________ - ANSWER -A. Site
B. Abnegation
C. Cleve
,D. None of the above
ANSWER A
7. 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. - ANSWER -A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
ANSWER B
8. Tanks that once where declared clean of fule oil could still again some time
later show sighnes of containing fule oil. - ANSWER -True/ False
True
9. Tanks should be tested for flammable liquids before they are _____________. -
ANSWER -A. Denigrated
B. Dispelled
C. Transported
D. A and B
ANSWER C
10. What are the three things that must be present in order for the fire triangle to
work - ANSWER -ANSWER Oxygen, fuel, source of ignition
11. In an oil tank is it the fuel oil that is burning or the vapors that are floating
above it. - ANSWER -A. Fuel Oil
B. Vapors
ANSWER Vapors
12. What are the factors that are important in combustion. - ANSWER -A.
Flammability range
B. Flammability compatibility
C. Ignition Temperature
,D. Ignition Potency
E. Flash point
F. Flash extortion
G. A,C,E
H. B,D,F
ANSWER G
13. What is ignition temperature - ANSWER -ANSWER
ignition temperature is the minimum temperature to chich a substance in air must
be heated in order to initiate or cause self sustained combustion independent of the
heating element.
44. Any liquid with a flash point of ________ degrees farenhight or less is
considered flammable. - ANSWER -ANSWER
100
45. Flash point is _____________ - ANSWER -ANSWER
it is the minimum temperature at which a substance produces sufficient flammable
vapors to support a flame when an ignition source is present.
46. When liquids are what is it that is actually on fire. - ANSWER -A. The liquids
B.
47. - ANSWER -
48. - ANSWER -
49. - ANSWER -
50. - ANSWER -
in accordance with the EPA Federal Regulations, which of the following events
must be reported to the state implementing Agency for tank removal. choose all
that apply - ANSWER -notice of intent to remove a UST
discovery of a suspected release
, discovery of a confirmed release
when entering a tank, what is the test result that must be achieved to safely
proceed with removal activities - ANSWER -oxygen reading of 5% or less
what is the flashpoint, as classified by osha and the NFPA, for flammable liquids?
- ANSWER -less than 100 degrees Fahrenheit
which of the following ANSWERs best describes the process of purging a tank -
ANSWER -ventilating with tank using an educator-type air mover driven by
compressed air.
ventilation using defused air blower
which of these petroleum constituents is described as colorless, water insoluble
liquid with a smell associated with paint thinners and upon low-to-moderate
inhalation can cause: tiredness, confusion, weakness, drunken type actions,
memory loss, nausea, loss of appetite, hearing loss, and color vision loss? -
ANSWER -toluene
which of these petroleum constituents is described as a volatile, flammable, and
colorless liquid that is sparingly soluble in water and was phased out of use in
gasoline do to its solubility in water, which resulted in contamination of water
resources in numerous states? - ANSWER -methyl tert butyl ether (MTBE)
which of the following ANSWERs Defines viscosity? - ANSWER -the measure of
the products resistance to gravity flow
for type a soil, what is the maximum allowable slope for a simple slope excavation
of 20 ft or less? - ANSWER -3/4:1
what is the maximum allowable slope? - ANSWER -the steepest incline of an
excavation face that is acceptable for the most favorable site condition as a
protection against cave-ins, and is expressed as the ratio of horizontal distance to
Vertical rise
2025/2026 | Actual Questions and
Answers Verified 100% Correct
1. 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. - ANSWER -A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
ANSWER A
2. 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. - ANSWER -A. Explosive detonation
B.
3. The tank atmosphere and the excavation area should be regularly tested why.
for flammable or combustible vapor - ANSWER -ANSWER
For flammable or combustible vapor
4. What device should be used to test the tank - ANSWER -Combustible gas
indicator probe into the fill opening at the bottom
5. Readings ______% or less of the lower flammable limit must be obtained
before the tank is considered safe for removal from the ground. - ANSWER -20%
ANSWER
6. Thanks should be labeled after removal from the ground but prior to removal
from the ______________ - ANSWER -A. Site
B. Abnegation
C. Cleve
,D. None of the above
ANSWER A
7. 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. - ANSWER -A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
ANSWER B
8. Tanks that once where declared clean of fule oil could still again some time
later show sighnes of containing fule oil. - ANSWER -True/ False
True
9. Tanks should be tested for flammable liquids before they are _____________. -
ANSWER -A. Denigrated
B. Dispelled
C. Transported
D. A and B
ANSWER C
10. What are the three things that must be present in order for the fire triangle to
work - ANSWER -ANSWER Oxygen, fuel, source of ignition
11. In an oil tank is it the fuel oil that is burning or the vapors that are floating
above it. - ANSWER -A. Fuel Oil
B. Vapors
ANSWER Vapors
12. What are the factors that are important in combustion. - ANSWER -A.
Flammability range
B. Flammability compatibility
C. Ignition Temperature
,D. Ignition Potency
E. Flash point
F. Flash extortion
G. A,C,E
H. B,D,F
ANSWER G
13. What is ignition temperature - ANSWER -ANSWER
ignition temperature is the minimum temperature to chich a substance in air must
be heated in order to initiate or cause self sustained combustion independent of the
heating element.
44. Any liquid with a flash point of ________ degrees farenhight or less is
considered flammable. - ANSWER -ANSWER
100
45. Flash point is _____________ - ANSWER -ANSWER
it is the minimum temperature at which a substance produces sufficient flammable
vapors to support a flame when an ignition source is present.
46. When liquids are what is it that is actually on fire. - ANSWER -A. The liquids
B.
47. - ANSWER -
48. - ANSWER -
49. - ANSWER -
50. - ANSWER -
in accordance with the EPA Federal Regulations, which of the following events
must be reported to the state implementing Agency for tank removal. choose all
that apply - ANSWER -notice of intent to remove a UST
discovery of a suspected release
, discovery of a confirmed release
when entering a tank, what is the test result that must be achieved to safely
proceed with removal activities - ANSWER -oxygen reading of 5% or less
what is the flashpoint, as classified by osha and the NFPA, for flammable liquids?
- ANSWER -less than 100 degrees Fahrenheit
which of the following ANSWERs best describes the process of purging a tank -
ANSWER -ventilating with tank using an educator-type air mover driven by
compressed air.
ventilation using defused air blower
which of these petroleum constituents is described as colorless, water insoluble
liquid with a smell associated with paint thinners and upon low-to-moderate
inhalation can cause: tiredness, confusion, weakness, drunken type actions,
memory loss, nausea, loss of appetite, hearing loss, and color vision loss? -
ANSWER -toluene
which of these petroleum constituents is described as a volatile, flammable, and
colorless liquid that is sparingly soluble in water and was phased out of use in
gasoline do to its solubility in water, which resulted in contamination of water
resources in numerous states? - ANSWER -methyl tert butyl ether (MTBE)
which of the following ANSWERs Defines viscosity? - ANSWER -the measure of
the products resistance to gravity flow
for type a soil, what is the maximum allowable slope for a simple slope excavation
of 20 ft or less? - ANSWER -3/4:1
what is the maximum allowable slope? - ANSWER -the steepest incline of an
excavation face that is acceptable for the most favorable site condition as a
protection against cave-ins, and is expressed as the ratio of horizontal distance to
Vertical rise
