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ARIZONA UST CLASS B OPERATOR EXAM –
ULTIMATE PREP BANK (200+ QUESTIONS)
## Table of Contents
1. **Spill & Overfill Prevention** (25 questions)
2. **Corrosion Protection** (20 questions)
3. **Release Detection – ATG & Interstitial** (25 questions)
4. **Release Detection – Vapor & Groundwater** (20 questions)
5. **Walkthrough Inspections** (20 questions)
6. **Piping, Sumps, & Dispensers** (20 questions)
7. **Reporting & Recordkeeping** (20 questions)
8. **Operator Roles (Class A/B/C)** (15 questions)
9. **Emergency Response & Spill Reporting** (15 questions)
10. **Temporary & Permanent Closure** (15 questions)
11. **Financial Responsibility** (10 questions)
12. **Arizona-Specific ADEQ Rules & Forms** (15 questions)
13. **Integrity Testing & Maintenance** (15 questions)
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# Section 1: Spill & Overfill Prevention (25 Questions)
**1.** What is the minimum acceptable flow rate for a functional
automatic shutoff device (ball float valve) during a gasoline delivery?
A. 5 gpm
B. 10 gpm
C. 95% of the maximum flow rate
D. 50 gpm
**Correct Answer: C**
*Rationale:* Automatic shutoff devices must shut off flow when the
tank is 95% full, not based on a fixed gpm. A, B, D are arbitrary and
incorrect per 40 CFR 280.241.
**2.** An operator notices a sheen on the concrete pad around the fill
port after delivery. What must be done FIRST?
A. Wait for it to evaporate
B. Cover with absorbent and report to ADEQ within 24 hours
C. Wash down the pad with a hose
D. Dig up the concrete to check for leaks
**Correct Answer: B**
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*Rationale:* Any release (including sheen) must be contained
immediately with absorbent, then reported to ADEQ per A.A.C. R18-12-
268. Washing spreads contamination; waiting violates reporting.
**3.** Which overfill prevention equipment is acceptable for a tank
receiving deliveries ≤ 25 gpm?
A. Automatic shutoff device only
B. Overfill alarm (audible) only
C. Automatic shutoff device OR overfill alarm (audible)
D. Manual gauging every 5 minutes
**Correct Answer: C**
*Rationale:* AZ rules allow either a functioning automatic shutoff
device or a high-level audible alarm for low-flow deliveries (≤25 gpm).
Manual gauging is not a substitute.
**4.** A spill bucket fails a vacuum test. What is the maximum time
allowed to repair it?
A. No grace period – immediate repair required
B. 14 days
C. 30 days
D. 60 days with ADEQ approval
**Correct Answer: B**
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*Rationale:* Under R18-12-236, spill bucket failures (leaks) must be
repaired within 14 days; otherwise, the UST must be taken out of
service.
**5.** During delivery, the delivery driver overfills the tank and product
discharges to the ground. Who is responsible for reporting?
A. Only the tank owner
B. Only the delivery driver
C. Both the owner and the operator (Class B)
D. The local fire department
**Correct Answer: C**
*Rationale:* Both the owner/operator (Class B) and the delivery
company are responsible for immediate containment and reporting under
Arizona’s joint liability rules.
**6.** What is the minimum annual test requirement for spill buckets?
A. Visual inspection only
B. Vacuum test or liquid-tightness test
C. Pressure test at 5 psi
D. No test if bucket appears dry
**Correct Answer: B**
ARIZONA UST CLASS B OPERATOR EXAM –
ULTIMATE PREP BANK (200+ QUESTIONS)
## Table of Contents
1. **Spill & Overfill Prevention** (25 questions)
2. **Corrosion Protection** (20 questions)
3. **Release Detection – ATG & Interstitial** (25 questions)
4. **Release Detection – Vapor & Groundwater** (20 questions)
5. **Walkthrough Inspections** (20 questions)
6. **Piping, Sumps, & Dispensers** (20 questions)
7. **Reporting & Recordkeeping** (20 questions)
8. **Operator Roles (Class A/B/C)** (15 questions)
9. **Emergency Response & Spill Reporting** (15 questions)
10. **Temporary & Permanent Closure** (15 questions)
11. **Financial Responsibility** (10 questions)
12. **Arizona-Specific ADEQ Rules & Forms** (15 questions)
13. **Integrity Testing & Maintenance** (15 questions)
---
,2|Page
# Section 1: Spill & Overfill Prevention (25 Questions)
**1.** What is the minimum acceptable flow rate for a functional
automatic shutoff device (ball float valve) during a gasoline delivery?
A. 5 gpm
B. 10 gpm
C. 95% of the maximum flow rate
D. 50 gpm
**Correct Answer: C**
*Rationale:* Automatic shutoff devices must shut off flow when the
tank is 95% full, not based on a fixed gpm. A, B, D are arbitrary and
incorrect per 40 CFR 280.241.
**2.** An operator notices a sheen on the concrete pad around the fill
port after delivery. What must be done FIRST?
A. Wait for it to evaporate
B. Cover with absorbent and report to ADEQ within 24 hours
C. Wash down the pad with a hose
D. Dig up the concrete to check for leaks
**Correct Answer: B**
,3|Page
*Rationale:* Any release (including sheen) must be contained
immediately with absorbent, then reported to ADEQ per A.A.C. R18-12-
268. Washing spreads contamination; waiting violates reporting.
**3.** Which overfill prevention equipment is acceptable for a tank
receiving deliveries ≤ 25 gpm?
A. Automatic shutoff device only
B. Overfill alarm (audible) only
C. Automatic shutoff device OR overfill alarm (audible)
D. Manual gauging every 5 minutes
**Correct Answer: C**
*Rationale:* AZ rules allow either a functioning automatic shutoff
device or a high-level audible alarm for low-flow deliveries (≤25 gpm).
Manual gauging is not a substitute.
**4.** A spill bucket fails a vacuum test. What is the maximum time
allowed to repair it?
A. No grace period – immediate repair required
B. 14 days
C. 30 days
D. 60 days with ADEQ approval
**Correct Answer: B**
, 4|Page
*Rationale:* Under R18-12-236, spill bucket failures (leaks) must be
repaired within 14 days; otherwise, the UST must be taken out of
service.
**5.** During delivery, the delivery driver overfills the tank and product
discharges to the ground. Who is responsible for reporting?
A. Only the tank owner
B. Only the delivery driver
C. Both the owner and the operator (Class B)
D. The local fire department
**Correct Answer: C**
*Rationale:* Both the owner/operator (Class B) and the delivery
company are responsible for immediate containment and reporting under
Arizona’s joint liability rules.
**6.** What is the minimum annual test requirement for spill buckets?
A. Visual inspection only
B. Vacuum test or liquid-tightness test
C. Pressure test at 5 psi
D. No test if bucket appears dry
**Correct Answer: B**
