Page 1 of 104
Arizona Underground Storage Tank Operator Exam (Class C)
EXAM QUESTIONS AND CORRECT VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR – JUST RELEASED
Arizona Underground Storage Tank Operator Exam (Class C) – Complete 250-Question Practice
Bank
10-LINE EXAM COVERAGE IN POINTS FORM
1. Class C Operator Definition & Role – The Class C operator is the daily on-site employee
responsible for the initial response to alarms, spills, and emergencies at UST facilities .
Class C operators must be trained before assuming their role and work under the
direction of Class A/B operators .
2. Training & Certification Requirements – Class C operators can be trained by a Class A or
B operator, complete an approved training program, or pass a comparable examination .
Training records must be maintained for at least 3 years and available during
inspections .
3. Emergency Response Priority – The Class C operator's primary duty is responding to
emergencies, spills, alarms, and suspected releases . Safety is always the first priority in
any UST emergency .
4. Spill & Release Response – Upon discovering a spill or suspected release, the Class C
operator must initiate spill response procedures immediately . For spills exceeding 25
gallons (or any amount causing a sheen on water), DEQ must be notified within 24
hours .
5. Alarm Response – When an alarm sounds, the Class C operator must investigate the
cause and respond according to procedures . If unsure, the Class A or B operator must be
contacted immediately .
6. Leak Detection & Monitoring – Class C operators must recognize indicators of leaks:
unusual alarm signals, fuel odors, unexplained inventory losses, or visible signs of
contamination . Leak detection systems help identify potential problems early .
7. Fuel Delivery Monitoring – Class C operators must supervise fuel deliveries by observing
for potential overfills or spills . Spill buckets are required to catch spills during fuel
delivery .
8. Safety & Emergency Equipment – Class C operators must know the location of spill kits,
fire extinguishers, emergency shut-off switches, and understand their proper use .
Smoking and cell phone use are prohibited near fueling areas .
9. Reporting & Documentation – Suspected releases require immediate notification to the
Class A or B operator . Class C operators are not responsible for direct DEQ notification;
that falls to Class A/B operators .
, Page 2 of 104
10. Retraining & Compliance – Class C operator training is valid for up to 3 years unless
retraining is required due to significant non-compliance . Failure to comply with training
requirements may result in enforcement action .
100 PRACTICE QUESTIONS WITH RATIONALES
QUESTION 1
What is the primary responsibility of a Class C Underground Storage Tank (UST) operator in
Arizona?
A) Maintaining compliance documentation
B) Overseeing daily tank operations
C) Managing financial responsibility requirements
D) Responding to emergencies such as spills or alarms
Correct Answer: D
Rationale: The Class C operator is specifically responsible for initiating emergency response
actions when alarms, spills, or releases occur at a UST facility . Class A operators are responsible
for overall compliance, Class B operators oversee daily operations, and Class C operators are the
front-line emergency responders .
QUESTION 2
According to ARS § 49-1083, when must a Class C operator receive training before assuming
their role?
, Page 3 of 104
A) Within 30 days of hire
B) Within 60 days of hire
C) Before assuming the role
D) At the annual safety meeting
Correct Answer: C
Rationale: According to Arizona Revised Statutes § 49-1083(C), Class C individuals must be
trained "before assuming the role of a class C individual" . This is different from Class A and B
operators, who have 30 days to complete training after being designated .
QUESTION 3
A Class C operator's primary responsibility is to:
A) Conduct monthly inspections of all UST equipment
B) Respond to alarms, spills, and emergencies
C) Maintain financial responsibility records
D) Oversee tank installation and closure
Correct Answer: B
Rationale: Class C operators are front-line employees who work directly at the fueling location.
Their primary duty involves "initial response procedures to an alarm or other indication of an
emergency caused by a release or suspected release" .
, Page 4 of 104
QUESTION 4
According to ARS § 49-1083, for an attended facility, a Class C operator must be:
A) Available by phone at all times
B) On site during the usual and customary hours of operation
C) Present only during fuel deliveries
D) On call 24 hours a day, 7 days a week
Correct Answer: B
Rationale: ARS § 49-1083(C) states that "for an attended facility, a class C individual must be on
site during the usual and customary hours of operation" . This ensures that trained personnel
are physically present to respond to emergencies during business hours.
QUESTION 5
Before taking over your duties as a Class C operator, you must talk with your supervisor to:
A) Become certified in CPR
B) Learn what your company procedures are for dealing with tank-related alarms
C) Learn how to tell if someone is over the legal drinking age
D) Locate the repair manual for the fuel dispensers
Correct Answer: B
Rationale: Understanding company-specific procedures for dealing with alarms is essential
before assuming Class C duties . Each facility may have different emergency response protocols,
alarm systems, and reporting requirements that must be followed .
Arizona Underground Storage Tank Operator Exam (Class C)
EXAM QUESTIONS AND CORRECT VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR – JUST RELEASED
Arizona Underground Storage Tank Operator Exam (Class C) – Complete 250-Question Practice
Bank
10-LINE EXAM COVERAGE IN POINTS FORM
1. Class C Operator Definition & Role – The Class C operator is the daily on-site employee
responsible for the initial response to alarms, spills, and emergencies at UST facilities .
Class C operators must be trained before assuming their role and work under the
direction of Class A/B operators .
2. Training & Certification Requirements – Class C operators can be trained by a Class A or
B operator, complete an approved training program, or pass a comparable examination .
Training records must be maintained for at least 3 years and available during
inspections .
3. Emergency Response Priority – The Class C operator's primary duty is responding to
emergencies, spills, alarms, and suspected releases . Safety is always the first priority in
any UST emergency .
4. Spill & Release Response – Upon discovering a spill or suspected release, the Class C
operator must initiate spill response procedures immediately . For spills exceeding 25
gallons (or any amount causing a sheen on water), DEQ must be notified within 24
hours .
5. Alarm Response – When an alarm sounds, the Class C operator must investigate the
cause and respond according to procedures . If unsure, the Class A or B operator must be
contacted immediately .
6. Leak Detection & Monitoring – Class C operators must recognize indicators of leaks:
unusual alarm signals, fuel odors, unexplained inventory losses, or visible signs of
contamination . Leak detection systems help identify potential problems early .
7. Fuel Delivery Monitoring – Class C operators must supervise fuel deliveries by observing
for potential overfills or spills . Spill buckets are required to catch spills during fuel
delivery .
8. Safety & Emergency Equipment – Class C operators must know the location of spill kits,
fire extinguishers, emergency shut-off switches, and understand their proper use .
Smoking and cell phone use are prohibited near fueling areas .
9. Reporting & Documentation – Suspected releases require immediate notification to the
Class A or B operator . Class C operators are not responsible for direct DEQ notification;
that falls to Class A/B operators .
, Page 2 of 104
10. Retraining & Compliance – Class C operator training is valid for up to 3 years unless
retraining is required due to significant non-compliance . Failure to comply with training
requirements may result in enforcement action .
100 PRACTICE QUESTIONS WITH RATIONALES
QUESTION 1
What is the primary responsibility of a Class C Underground Storage Tank (UST) operator in
Arizona?
A) Maintaining compliance documentation
B) Overseeing daily tank operations
C) Managing financial responsibility requirements
D) Responding to emergencies such as spills or alarms
Correct Answer: D
Rationale: The Class C operator is specifically responsible for initiating emergency response
actions when alarms, spills, or releases occur at a UST facility . Class A operators are responsible
for overall compliance, Class B operators oversee daily operations, and Class C operators are the
front-line emergency responders .
QUESTION 2
According to ARS § 49-1083, when must a Class C operator receive training before assuming
their role?
, Page 3 of 104
A) Within 30 days of hire
B) Within 60 days of hire
C) Before assuming the role
D) At the annual safety meeting
Correct Answer: C
Rationale: According to Arizona Revised Statutes § 49-1083(C), Class C individuals must be
trained "before assuming the role of a class C individual" . This is different from Class A and B
operators, who have 30 days to complete training after being designated .
QUESTION 3
A Class C operator's primary responsibility is to:
A) Conduct monthly inspections of all UST equipment
B) Respond to alarms, spills, and emergencies
C) Maintain financial responsibility records
D) Oversee tank installation and closure
Correct Answer: B
Rationale: Class C operators are front-line employees who work directly at the fueling location.
Their primary duty involves "initial response procedures to an alarm or other indication of an
emergency caused by a release or suspected release" .
, Page 4 of 104
QUESTION 4
According to ARS § 49-1083, for an attended facility, a Class C operator must be:
A) Available by phone at all times
B) On site during the usual and customary hours of operation
C) Present only during fuel deliveries
D) On call 24 hours a day, 7 days a week
Correct Answer: B
Rationale: ARS § 49-1083(C) states that "for an attended facility, a class C individual must be on
site during the usual and customary hours of operation" . This ensures that trained personnel
are physically present to respond to emergencies during business hours.
QUESTION 5
Before taking over your duties as a Class C operator, you must talk with your supervisor to:
A) Become certified in CPR
B) Learn what your company procedures are for dealing with tank-related alarms
C) Learn how to tell if someone is over the legal drinking age
D) Locate the repair manual for the fuel dispensers
Correct Answer: B
Rationale: Understanding company-specific procedures for dealing with alarms is essential
before assuming Class C duties . Each facility may have different emergency response protocols,
alarm systems, and reporting requirements that must be followed .
