Arizona Underground Storage Tank Operator Exam (Class B) Exam
Practice 200 Questions And Correct Answers (Verified Answers) Plus
Rationale 2026 Q & A
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1. What is the primary responsibility of a Class B UST Operator in
Arizona?
a) To conduct daily delivery inspections
b) To implement the day-to-day aspects of operation, maintenance, and
recordkeeping
c) To respond to major releases and alarms only
d) To design and install new UST systems
Correct Answer: b) To implement the day-to-day aspects of operation,
maintenance, and recordkeeping
Rationale: Under ADEQ rules (A.A.C. R18-12-301), the Class B Operator
is responsible for the operational, maintenance, and recordkeeping
duties at a UST facility. This includes ensuring systems function
correctly, overseeing Class C operators, and maintaining compliance
documentation.
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2. How often must a Class B Operator perform a documented
walkthrough inspection of the UST facility?
a) Daily
b) Weekly
c) Monthly
d) Quarterly
Correct Answer: c) Monthly
Rationale: ADEQ requires Class B Operators to conduct a walkthrough
inspection at least once every 30 days. This inspection must check spill
buckets, fill ports, sumps, release detection equipment, and
containment sumps for damage, debris, or liquid.
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3. According to Arizona regulations, what is the maximum time allowed
between release detection tests for a pressurized piping system?
a) 15 days
b) 30 days
,c) 60 days
d) 90 days
Correct Answer: b) 30 days
Rationale: Pressurized piping (typical for fuel dispensers) must have
automatic line leak detection (e.g., electronic or mechanical devices)
that performs a test at least every 30 days. Alternatively, annual line
tightness testing is allowed if daily monitoring is not possible.
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4. Which of the following is an acceptable method of release detection
for a UST containing gasoline?
a) Visual inspection of the tank interior once per year
b) Automatic Tank Gauging (ATG) with inventory control
c) Manual stick measurement only
d) Waiting for a customer complaint about odors
Correct Answer: b) Automatic Tank Gauging (ATG) with inventory
control
, Rationale: ADEQ accepts ATG as a primary release detection method
when combined with monthly inventory reconciliation or continuous
monitoring. Manual stick alone is not sufficient for compliance. Release
detection must be capable of detecting a 0.2 gallon per hour leak.
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5. What must a Class B Operator do immediately upon an alarm from a
continuous electronic monitoring system?
a) Reset the alarm and note it in the logbook
b) Call the fire department
c) Investigate the cause and take corrective action
d) Ignore it if it happens during business hours
Correct Answer: c) Investigate the cause and take corrective action
Rationale: Operators must respond to any alarm as a potential leak. The
Class B Operator must investigate, determine the cause (e.g., water
intrusion, sensor failure, actual leak), document findings, and take
corrective action. Failure to respond is a violation.
---
Practice 200 Questions And Correct Answers (Verified Answers) Plus
Rationale 2026 Q & A
---
1. What is the primary responsibility of a Class B UST Operator in
Arizona?
a) To conduct daily delivery inspections
b) To implement the day-to-day aspects of operation, maintenance, and
recordkeeping
c) To respond to major releases and alarms only
d) To design and install new UST systems
Correct Answer: b) To implement the day-to-day aspects of operation,
maintenance, and recordkeeping
Rationale: Under ADEQ rules (A.A.C. R18-12-301), the Class B Operator
is responsible for the operational, maintenance, and recordkeeping
duties at a UST facility. This includes ensuring systems function
correctly, overseeing Class C operators, and maintaining compliance
documentation.
,---
2. How often must a Class B Operator perform a documented
walkthrough inspection of the UST facility?
a) Daily
b) Weekly
c) Monthly
d) Quarterly
Correct Answer: c) Monthly
Rationale: ADEQ requires Class B Operators to conduct a walkthrough
inspection at least once every 30 days. This inspection must check spill
buckets, fill ports, sumps, release detection equipment, and
containment sumps for damage, debris, or liquid.
---
3. According to Arizona regulations, what is the maximum time allowed
between release detection tests for a pressurized piping system?
a) 15 days
b) 30 days
,c) 60 days
d) 90 days
Correct Answer: b) 30 days
Rationale: Pressurized piping (typical for fuel dispensers) must have
automatic line leak detection (e.g., electronic or mechanical devices)
that performs a test at least every 30 days. Alternatively, annual line
tightness testing is allowed if daily monitoring is not possible.
---
4. Which of the following is an acceptable method of release detection
for a UST containing gasoline?
a) Visual inspection of the tank interior once per year
b) Automatic Tank Gauging (ATG) with inventory control
c) Manual stick measurement only
d) Waiting for a customer complaint about odors
Correct Answer: b) Automatic Tank Gauging (ATG) with inventory
control
, Rationale: ADEQ accepts ATG as a primary release detection method
when combined with monthly inventory reconciliation or continuous
monitoring. Manual stick alone is not sufficient for compliance. Release
detection must be capable of detecting a 0.2 gallon per hour leak.
---
5. What must a Class B Operator do immediately upon an alarm from a
continuous electronic monitoring system?
a) Reset the alarm and note it in the logbook
b) Call the fire department
c) Investigate the cause and take corrective action
d) Ignore it if it happens during business hours
Correct Answer: c) Investigate the cause and take corrective action
Rationale: Operators must respond to any alarm as a potential leak. The
Class B Operator must investigate, determine the cause (e.g., water
intrusion, sensor failure, actual leak), document findings, and take
corrective action. Failure to respond is a violation.
---
