Arizona Underground Storage Tank Operator Exam (Class B) –
Practice 200 Questions & Answers with Rationale (2026)
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Q1. Which individual has day-to-day responsibility for implementing applicable regulatory
requirements, typically overseeing in-field aspects of operation, maintenance, and record-
keeping?
A. Class A Operator
B. Class B Operator
C. Class C Operator
D. Class D Operator
Correct Answer: B
Rationale: A Class B Operator is responsible for the daily implementation of UST regulatory
requirements, focusing on operational, maintenance, and recordkeeping tasks at the facility.
The Class A Operator handles broad compliance oversight, while Class C responds to
emergencies.
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Q2. The Class A and Class B certification must be renewed every:
A. 2 years
B. 3 years
C. 5 years
D. 10 years
,Correct Answer: C
Rationale: Arizona ADEQ requires Class A and Class B operator certifications to be renewed
every five years. Class C training must be renewed annually.
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Q3. Who must be present at the facility during operating hours to respond to alarms or
emergencies?
A. Class A Operator
B. Class B Operator
C. Class C Operator
D. Both A and B
Correct Answer: C
Rationale: The Class C Operator is the designated individual (often an employee) who can
respond to alarms, spills, or emergencies. They are not required to have the same level of
technical knowledge as A or B operators.
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Q4. Under Arizona rules, how many Class C operators must be designated per facility?
A. At least one per shift
B. Only one total
C. One per tank
D. None if Class B is on-site
Correct Answer: A
,Rationale: Each facility must have at least one Class C operator on duty during all operating
hours to ensure immediate emergency response.
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Q5. Which of the following is NOT a primary duty of a Class B operator?
A. Performing release detection testing
B. Maintaining required records
C. Obtaining environmental permits for new construction
D. Responding to a small spill with absorbents
Correct Answer: C
Rationale: Obtaining environmental permits for new construction is typically a Class A
operator’s responsibility. Class B focuses on daily O&M and immediate spill response.
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Q6. If a facility has both gasoline and heating oil USTs, who is responsible for ensuring the Class
C operators are trained?
A. The fuel supplier
B. The Class B operator
C. The local fire department
D. The tank manufacturer
Correct Answer: B
Rationale: The Class B operator is responsible for training and designating Class C operators,
regardless of the product stored.
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Q7. The Arizona UST operator classification system is based on:
A. EPA’s 2015 Underground Storage Tank regulation
B. Local municipal codes
C. NFPA 30
D. OSHA 1910.106
Correct Answer: A
Rationale: The three-tiered operator training system (A, B, C) was mandated by the EPA 2015
UST regulation and adopted by Arizona ADEQ.
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Q8. A Class B operator must be able to:
A. Only turn off the dispenser in an emergency
B. Operate and maintain all UST equipment
C. Approve major repairs
D. Design a new UST system
Correct Answer: B
Rationale: Class B operators are required to know how to operate, maintain, and troubleshoot
all equipment at the facility, including ATGs, spill buckets, and dispensers.
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Practice 200 Questions & Answers with Rationale (2026)
---
Q1. Which individual has day-to-day responsibility for implementing applicable regulatory
requirements, typically overseeing in-field aspects of operation, maintenance, and record-
keeping?
A. Class A Operator
B. Class B Operator
C. Class C Operator
D. Class D Operator
Correct Answer: B
Rationale: A Class B Operator is responsible for the daily implementation of UST regulatory
requirements, focusing on operational, maintenance, and recordkeeping tasks at the facility.
The Class A Operator handles broad compliance oversight, while Class C responds to
emergencies.
---
Q2. The Class A and Class B certification must be renewed every:
A. 2 years
B. 3 years
C. 5 years
D. 10 years
,Correct Answer: C
Rationale: Arizona ADEQ requires Class A and Class B operator certifications to be renewed
every five years. Class C training must be renewed annually.
---
Q3. Who must be present at the facility during operating hours to respond to alarms or
emergencies?
A. Class A Operator
B. Class B Operator
C. Class C Operator
D. Both A and B
Correct Answer: C
Rationale: The Class C Operator is the designated individual (often an employee) who can
respond to alarms, spills, or emergencies. They are not required to have the same level of
technical knowledge as A or B operators.
---
Q4. Under Arizona rules, how many Class C operators must be designated per facility?
A. At least one per shift
B. Only one total
C. One per tank
D. None if Class B is on-site
Correct Answer: A
,Rationale: Each facility must have at least one Class C operator on duty during all operating
hours to ensure immediate emergency response.
---
Q5. Which of the following is NOT a primary duty of a Class B operator?
A. Performing release detection testing
B. Maintaining required records
C. Obtaining environmental permits for new construction
D. Responding to a small spill with absorbents
Correct Answer: C
Rationale: Obtaining environmental permits for new construction is typically a Class A
operator’s responsibility. Class B focuses on daily O&M and immediate spill response.
---
Q6. If a facility has both gasoline and heating oil USTs, who is responsible for ensuring the Class
C operators are trained?
A. The fuel supplier
B. The Class B operator
C. The local fire department
D. The tank manufacturer
Correct Answer: B
Rationale: The Class B operator is responsible for training and designating Class C operators,
regardless of the product stored.
, ---
Q7. The Arizona UST operator classification system is based on:
A. EPA’s 2015 Underground Storage Tank regulation
B. Local municipal codes
C. NFPA 30
D. OSHA 1910.106
Correct Answer: A
Rationale: The three-tiered operator training system (A, B, C) was mandated by the EPA 2015
UST regulation and adopted by Arizona ADEQ.
---
Q8. A Class B operator must be able to:
A. Only turn off the dispenser in an emergency
B. Operate and maintain all UST equipment
C. Approve major repairs
D. Design a new UST system
Correct Answer: B
Rationale: Class B operators are required to know how to operate, maintain, and troubleshoot
all equipment at the facility, including ATGs, spill buckets, and dispensers.
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