ICC U2 UST DECOMMISSIONING
EXAM BUNDLE 150 EXPERT
QUESTIONS ANSWERS and
RATIONALES VERIFIED PASS
1. An environmental contractor is preparing a
comprehensive site safety layout plan to decommission a
retail fueling station. When underground storage tank
(UST) systems are determined to be no longer structurally
sound, needed, or suitable for continued product storage,
federal and industry standards dictate that they must be
handled in a specific way. How must these systems be
dealt with according to regulatory guidelines?
A. Left empty indefinitely without tracking
B. Converted into temporary rainwater capture cells
C. Properly and permanently disposed of following safety
procedures
D. Filled with fresh tap water and left unsealed
Correct Answer: C
Rationale: Underground petroleum storage systems
that are no longer operational or needed pose long-term
leak and collapse hazards and must be permanently
decommissioned and disposed of according to EPA and
API guidelines.
2. A project manager is executing a contract to excavate and
safely extract several steel commercial petroleum tanks.
To ensure legal compliance, all field work that is
completed at an active decommissioning site must be
accomplished in strict accordance with which specific set
of rules?
, A. Federal, state, and local requirements as well as
accepted industry safety standards
B. Corporate profit margins and internal construction
schedules only
C. Standard residential plumbing codes and landscape
guidelines
D. Foreign maritime shipping protocols and container
standards
Correct Answer: A
Rationale: UST closure activities are heavily regulated
across multiple jurisdictions; all field actions must
comply with federal EPA rules, state laws, local fire
codes, and OSHA standards.
3. A field crew arrives at an abandoned vehicle maintenance
shop to begin cutting concrete away from the tank pad
area. Before any physical excavation, piping
disconnection, or tank structural handling can legally
begin at the job site, what mandatory administrative
requirement must first be completed by the contractor?
A. A verbal notification to adjacent residential property
neighbors
B. All applicable regulatory permits must be obtained from
the implementing agencies
C. A secondary commercial liability insurance policy must
be cancelled
D. The tank must be filled with compressed atmospheric
air
Correct Answer: B
Rationale: Regulatory agencies require formal closure
notifications and permits before breaking ground to
ensure environmental oversight and verification of safety
protocols.
,4. During a morning tail-gate safety meeting, a safety
inspector outlines the direct physical hazards that field
technicians are exposed to during a standard petroleum
tank extraction. What primary chemical dangers are
removers of petroleum tanks faced with at an active site?
A. Airborne asbestos dust and radioactive radon pockets
B. Petroleum hydrocarbon liquids, flammable vapors, and
contaminated solid wastes
C. Methane gas emissions from organic decomposition
only
D. Concentrated sulfuric acid and pressurized chlorine
vapors
Correct Answer: B
Rationale: Decommissioning risks are centered around
trapped liquid product, volatile organic compounds
(VOCs) creating explosive environments, and hazardous
sludge.
5. A technician enters the exclusion zone of a UST excavation
site and begins to experience mild physiological issues,
including sudden dizziness, uncoordinated movements,
and extreme mental excitement. These acute symptoms
are a direct medical indicator of which environmental
hazard?
A. Severe heat stroke from heavy protective suits
B. High occupational exposure via inhaling or absorbing
petroleum hydrocarbon vapors
C. Acute oxygen enrichment within the open breathing
zone
D. Microscopic particulate dust irritation from the
surrounding sand ballast
Correct Answer: B
Rationale: Hydrocarbon vapors act as central nervous
system depressants. Inhalation can rapidly induce
, dizziness, disorientation, euphoria, or unconsciousness if
proper ventilation is not maintained.
6. While monitoring an active tank purging operation, a
supervisor observes a worker collapse near the open tank
manway due to localized vapor accumulation. After
moving the worker to fresh air, the emergency first aid
responder notices that the individual has stopped
breathing completely. What immediate emergency action
should be taken?
A. Pour cold water directly on the worker’s face
B. Apply artificial respiration (CPR) immediately and
summon emergency medical services
C. Keep the worker in a vertical, standing position
D. Wait for the chemical symptoms to fade naturally
without intervention
Correct Answer: B
Rationale: Severe exposure to toxic vapors can
suppress the respiratory system entirely, demanding
instant artificial respiration or CPR to maintain
oxygenation to vital organs.
7. An environmental contractor is conducting safety training
regarding Personal Protective Equipment (PPE). The
instructor explains that petroleum liquids are chemical
irritants and systemic hazards that must be kept away
from specific vulnerable parts of the body. Which parts of
the human anatomy require strict protection from liquid
contact?
A. Hair, fingernails, and clothing surfaces
B. The eyes, the skin, and the mouth
C. The skeletal system and outer tooth enamel only
D. Internal muscular tissue and joint linings
Correct Answer: B
Rationale: Dermal absorption and ingestion are major
EXAM BUNDLE 150 EXPERT
QUESTIONS ANSWERS and
RATIONALES VERIFIED PASS
1. An environmental contractor is preparing a
comprehensive site safety layout plan to decommission a
retail fueling station. When underground storage tank
(UST) systems are determined to be no longer structurally
sound, needed, or suitable for continued product storage,
federal and industry standards dictate that they must be
handled in a specific way. How must these systems be
dealt with according to regulatory guidelines?
A. Left empty indefinitely without tracking
B. Converted into temporary rainwater capture cells
C. Properly and permanently disposed of following safety
procedures
D. Filled with fresh tap water and left unsealed
Correct Answer: C
Rationale: Underground petroleum storage systems
that are no longer operational or needed pose long-term
leak and collapse hazards and must be permanently
decommissioned and disposed of according to EPA and
API guidelines.
2. A project manager is executing a contract to excavate and
safely extract several steel commercial petroleum tanks.
To ensure legal compliance, all field work that is
completed at an active decommissioning site must be
accomplished in strict accordance with which specific set
of rules?
, A. Federal, state, and local requirements as well as
accepted industry safety standards
B. Corporate profit margins and internal construction
schedules only
C. Standard residential plumbing codes and landscape
guidelines
D. Foreign maritime shipping protocols and container
standards
Correct Answer: A
Rationale: UST closure activities are heavily regulated
across multiple jurisdictions; all field actions must
comply with federal EPA rules, state laws, local fire
codes, and OSHA standards.
3. A field crew arrives at an abandoned vehicle maintenance
shop to begin cutting concrete away from the tank pad
area. Before any physical excavation, piping
disconnection, or tank structural handling can legally
begin at the job site, what mandatory administrative
requirement must first be completed by the contractor?
A. A verbal notification to adjacent residential property
neighbors
B. All applicable regulatory permits must be obtained from
the implementing agencies
C. A secondary commercial liability insurance policy must
be cancelled
D. The tank must be filled with compressed atmospheric
air
Correct Answer: B
Rationale: Regulatory agencies require formal closure
notifications and permits before breaking ground to
ensure environmental oversight and verification of safety
protocols.
,4. During a morning tail-gate safety meeting, a safety
inspector outlines the direct physical hazards that field
technicians are exposed to during a standard petroleum
tank extraction. What primary chemical dangers are
removers of petroleum tanks faced with at an active site?
A. Airborne asbestos dust and radioactive radon pockets
B. Petroleum hydrocarbon liquids, flammable vapors, and
contaminated solid wastes
C. Methane gas emissions from organic decomposition
only
D. Concentrated sulfuric acid and pressurized chlorine
vapors
Correct Answer: B
Rationale: Decommissioning risks are centered around
trapped liquid product, volatile organic compounds
(VOCs) creating explosive environments, and hazardous
sludge.
5. A technician enters the exclusion zone of a UST excavation
site and begins to experience mild physiological issues,
including sudden dizziness, uncoordinated movements,
and extreme mental excitement. These acute symptoms
are a direct medical indicator of which environmental
hazard?
A. Severe heat stroke from heavy protective suits
B. High occupational exposure via inhaling or absorbing
petroleum hydrocarbon vapors
C. Acute oxygen enrichment within the open breathing
zone
D. Microscopic particulate dust irritation from the
surrounding sand ballast
Correct Answer: B
Rationale: Hydrocarbon vapors act as central nervous
system depressants. Inhalation can rapidly induce
, dizziness, disorientation, euphoria, or unconsciousness if
proper ventilation is not maintained.
6. While monitoring an active tank purging operation, a
supervisor observes a worker collapse near the open tank
manway due to localized vapor accumulation. After
moving the worker to fresh air, the emergency first aid
responder notices that the individual has stopped
breathing completely. What immediate emergency action
should be taken?
A. Pour cold water directly on the worker’s face
B. Apply artificial respiration (CPR) immediately and
summon emergency medical services
C. Keep the worker in a vertical, standing position
D. Wait for the chemical symptoms to fade naturally
without intervention
Correct Answer: B
Rationale: Severe exposure to toxic vapors can
suppress the respiratory system entirely, demanding
instant artificial respiration or CPR to maintain
oxygenation to vital organs.
7. An environmental contractor is conducting safety training
regarding Personal Protective Equipment (PPE). The
instructor explains that petroleum liquids are chemical
irritants and systemic hazards that must be kept away
from specific vulnerable parts of the body. Which parts of
the human anatomy require strict protection from liquid
contact?
A. Hair, fingernails, and clothing surfaces
B. The eyes, the skin, and the mouth
C. The skeletal system and outer tooth enamel only
D. Internal muscular tissue and joint linings
Correct Answer: B
Rationale: Dermal absorption and ingestion are major
