ICC California UST Service Technician Certification Study
Guide – Comprehensive Exam Prep Notes, Underground
Storage Tank Installation & Maintenance Training, ICC
UST Technician Practice Questions, Safety Regulations,
Inspection Procedures & Licensing Preparation Material
**Question 1: What is the primary regulatory body overseeing Underground Storage Tank
(UST) systems in California?
A. Environmental Protection Agency (EPA)
B. State Water Resources Control Board
C. Department of Industrial Relations
D. California Air Resources Board
CORRECT ANSWER: B. State Water Resources Control Board
Rationale: In California, the State Water Resources Control Board, along with Regional Water
Quality Control Boards, oversees the regulation and enforcement of UST systems to protect
groundwater.
**Question 2: Which California Code of Regulations Title primarily governs UST systems?
A. Title 8
B. Title 24
C. Title 23
D. Title 19
CORRECT ANSWER: C. Title 23
Rationale: California Code of Regulations Title 23, Division 3, Chapter 16 contains the specific
regulations for Underground Storage Tanks.
**Question 3: What is the minimum capacity threshold for a tank to be regulated as a UST in
California?
A. 110 gallons
B. 550 gallons
C. 1,100 gallons
D. 5,000 gallons
CORRECT ANSWER: A. 110 gallons
Rationale: Tanks storing regulated substances with a capacity of 110 gallons or more are
generally subject to UST regulations.
**Question 4: Which substance is NOT typically regulated under California UST regulations?
A. Gasoline
B. Diesel fuel
C. Heating oil used on-site
D. Crude oil
CORRECT ANSWER: C. Heating oil used on-site
Rationale: Heating oil used for consumptive use on the premises where it is stored is often
exempt from federal and state UST regulations.
**Question 5: What is the required frequency for testing cathodic protection systems on
USTs?
,A. Every 6 months
B. Every 12 months
C. Every 3 years
D. Every 5 years
CORRECT ANSWER: C. Every 3 years
Rationale: Cathodic protection systems must be tested by a qualified cathodic protection tester
every three years to ensure effectiveness.
**Question 6: Within how many days must a new UST installation be registered with the local
agency?
A. 10 days
B. 30 days
C. 45 days
D. 60 days
CORRECT ANSWER: B. 30 days
Rationale: California regulations typically require registration of new UST systems within 30
days of installation or before closure.
**Question 7: What is the primary purpose of a spill prevention container?
A. To detect leaks in piping
B. To catch spills during fuel delivery
C. To prevent overfilling the tank
D. To protect against corrosion
CORRECT ANSWER: B. To catch spills during fuel delivery
Rationale: Spill prevention containers are designed to catch small spills that occur when the
delivery hose is disconnected from the fill pipe.
**Question 8: Which leak detection method is required for pressurized piping?
A. Monthly inventory control
B. Annual tightness testing
C. Automatic line leak detector
D. Visual inspection
CORRECT ANSWER: C. Automatic line leak detector
Rationale: Pressurized piping systems must be equipped with an automatic line leak detector to
identify leaks promptly.
**Question 9: What is the maximum allowable annual leak rate for a tightness test?
A. 0.05 gallons per hour
B. 0.10 gallons per hour
C. 0.20 gallons per hour
D. 0.50 gallons per hour
CORRECT ANSWER: B. 0.10 gallons per hour
Rationale: Standard tightness testing criteria generally define a leak as a loss greater than 0.10
gallons per hour.
**Question 10: Who is authorized to perform cathodic protection testing?
,A. Any UST service technician
B. A qualified cathodic protection tester
C. The tank owner
D. The fuel delivery driver
CORRECT ANSWER: B. A qualified cathodic protection tester
Rationale: Only individuals who meet specific qualification standards for cathodic protection
testing are authorized to perform these tests.
**Question 11: What must be done if a cathodic protection test indicates failure?
A. Ignore until next test
B. Repair within 30 days
C. Replace the tank immediately
D. Notify the EPA only
CORRECT ANSWER: B. Repair within 30 days
Rationale: If a cathodic protection system fails testing, repairs must be made to ensure
protection within 30 days of the test.
**Question 12: Which component prevents vapors from escaping during tank filling?
A. Vent pipe
B. Vapor recovery adapter
C. Fill pipe cap
D. Submerged pump
CORRECT ANSWER: B. Vapor recovery adapter
Rationale: Vapor recovery adapters connect the delivery hose to capture vapors displaced
during filling, preventing atmospheric release.
**Question 13: What is the required setback distance from a building foundation for a UST?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
CORRECT ANSWER: B. 3 feet
Rationale: Regulations typically mandate a minimum horizontal distance of 3 feet between the
UST and any building foundation.
**Question 14: Which material is commonly used for non-corroding USTs?
A. Carbon steel
B. Fiberglass reinforced plastic (FRP)
C. Cast iron
D. Copper
CORRECT ANSWER: B. Fiberglass reinforced plastic (FRP)
Rationale: FRP tanks are non-corroding and are a common alternative to steel tanks requiring
cathodic protection.
**Question 15: What is the purpose of an overfill prevention device?
A. To stop flow when the tank is 95% full
B. To detect leaks in the tank bottom
, C. To filter contaminants from fuel
D. To measure tank temperature
CORRECT ANSWER: A. To stop flow when the tank is 95% full
Rationale: Overfill prevention devices automatically shut off or restrict flow when the tank
reaches 95% capacity to prevent spills.
**Question 16: How often must leak detection equipment be checked for proper operation?
A. Weekly
B. Monthly
C. Annually
D. Every 3 years
CORRECT ANSWER: B. Monthly
Rationale: Leak detection equipment must be checked monthly to ensure it is functioning
correctly and has not been tampered with.
**Question 17: What document must be kept on-site regarding UST installation?
A. Employee handbook
B. As-built drawings
C. Fuel delivery invoices
D. Customer receipts
CORRECT ANSWER: B. As-built drawings
Rationale: As-built drawings document the actual installation location and configuration of the
UST system and must be retained.
**Question 18: Which agency must be notified immediately upon confirmation of a suspected
release?
A. Local Fire Department
B. Regional Water Quality Control Board
C. Department of Motor Vehicles
D. Local Utility Company
CORRECT ANSWER: B. Regional Water Quality Control Board
Rationale: Confirmed releases must be reported to the Regional Water Quality Control Board
within specific timeframes (often 24 hours).
**Question 19: What is the minimum depth of cover required over a UST?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: B. 12 inches
Rationale: A minimum of 12 inches of cover is generally required to protect the tank from
surface loads and temperature fluctuations.
**Question 20: Which test verifies the integrity of the tank shell?
A. Cathodic protection test
B. Tightness test
Guide – Comprehensive Exam Prep Notes, Underground
Storage Tank Installation & Maintenance Training, ICC
UST Technician Practice Questions, Safety Regulations,
Inspection Procedures & Licensing Preparation Material
**Question 1: What is the primary regulatory body overseeing Underground Storage Tank
(UST) systems in California?
A. Environmental Protection Agency (EPA)
B. State Water Resources Control Board
C. Department of Industrial Relations
D. California Air Resources Board
CORRECT ANSWER: B. State Water Resources Control Board
Rationale: In California, the State Water Resources Control Board, along with Regional Water
Quality Control Boards, oversees the regulation and enforcement of UST systems to protect
groundwater.
**Question 2: Which California Code of Regulations Title primarily governs UST systems?
A. Title 8
B. Title 24
C. Title 23
D. Title 19
CORRECT ANSWER: C. Title 23
Rationale: California Code of Regulations Title 23, Division 3, Chapter 16 contains the specific
regulations for Underground Storage Tanks.
**Question 3: What is the minimum capacity threshold for a tank to be regulated as a UST in
California?
A. 110 gallons
B. 550 gallons
C. 1,100 gallons
D. 5,000 gallons
CORRECT ANSWER: A. 110 gallons
Rationale: Tanks storing regulated substances with a capacity of 110 gallons or more are
generally subject to UST regulations.
**Question 4: Which substance is NOT typically regulated under California UST regulations?
A. Gasoline
B. Diesel fuel
C. Heating oil used on-site
D. Crude oil
CORRECT ANSWER: C. Heating oil used on-site
Rationale: Heating oil used for consumptive use on the premises where it is stored is often
exempt from federal and state UST regulations.
**Question 5: What is the required frequency for testing cathodic protection systems on
USTs?
,A. Every 6 months
B. Every 12 months
C. Every 3 years
D. Every 5 years
CORRECT ANSWER: C. Every 3 years
Rationale: Cathodic protection systems must be tested by a qualified cathodic protection tester
every three years to ensure effectiveness.
**Question 6: Within how many days must a new UST installation be registered with the local
agency?
A. 10 days
B. 30 days
C. 45 days
D. 60 days
CORRECT ANSWER: B. 30 days
Rationale: California regulations typically require registration of new UST systems within 30
days of installation or before closure.
**Question 7: What is the primary purpose of a spill prevention container?
A. To detect leaks in piping
B. To catch spills during fuel delivery
C. To prevent overfilling the tank
D. To protect against corrosion
CORRECT ANSWER: B. To catch spills during fuel delivery
Rationale: Spill prevention containers are designed to catch small spills that occur when the
delivery hose is disconnected from the fill pipe.
**Question 8: Which leak detection method is required for pressurized piping?
A. Monthly inventory control
B. Annual tightness testing
C. Automatic line leak detector
D. Visual inspection
CORRECT ANSWER: C. Automatic line leak detector
Rationale: Pressurized piping systems must be equipped with an automatic line leak detector to
identify leaks promptly.
**Question 9: What is the maximum allowable annual leak rate for a tightness test?
A. 0.05 gallons per hour
B. 0.10 gallons per hour
C. 0.20 gallons per hour
D. 0.50 gallons per hour
CORRECT ANSWER: B. 0.10 gallons per hour
Rationale: Standard tightness testing criteria generally define a leak as a loss greater than 0.10
gallons per hour.
**Question 10: Who is authorized to perform cathodic protection testing?
,A. Any UST service technician
B. A qualified cathodic protection tester
C. The tank owner
D. The fuel delivery driver
CORRECT ANSWER: B. A qualified cathodic protection tester
Rationale: Only individuals who meet specific qualification standards for cathodic protection
testing are authorized to perform these tests.
**Question 11: What must be done if a cathodic protection test indicates failure?
A. Ignore until next test
B. Repair within 30 days
C. Replace the tank immediately
D. Notify the EPA only
CORRECT ANSWER: B. Repair within 30 days
Rationale: If a cathodic protection system fails testing, repairs must be made to ensure
protection within 30 days of the test.
**Question 12: Which component prevents vapors from escaping during tank filling?
A. Vent pipe
B. Vapor recovery adapter
C. Fill pipe cap
D. Submerged pump
CORRECT ANSWER: B. Vapor recovery adapter
Rationale: Vapor recovery adapters connect the delivery hose to capture vapors displaced
during filling, preventing atmospheric release.
**Question 13: What is the required setback distance from a building foundation for a UST?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
CORRECT ANSWER: B. 3 feet
Rationale: Regulations typically mandate a minimum horizontal distance of 3 feet between the
UST and any building foundation.
**Question 14: Which material is commonly used for non-corroding USTs?
A. Carbon steel
B. Fiberglass reinforced plastic (FRP)
C. Cast iron
D. Copper
CORRECT ANSWER: B. Fiberglass reinforced plastic (FRP)
Rationale: FRP tanks are non-corroding and are a common alternative to steel tanks requiring
cathodic protection.
**Question 15: What is the purpose of an overfill prevention device?
A. To stop flow when the tank is 95% full
B. To detect leaks in the tank bottom
, C. To filter contaminants from fuel
D. To measure tank temperature
CORRECT ANSWER: A. To stop flow when the tank is 95% full
Rationale: Overfill prevention devices automatically shut off or restrict flow when the tank
reaches 95% capacity to prevent spills.
**Question 16: How often must leak detection equipment be checked for proper operation?
A. Weekly
B. Monthly
C. Annually
D. Every 3 years
CORRECT ANSWER: B. Monthly
Rationale: Leak detection equipment must be checked monthly to ensure it is functioning
correctly and has not been tampered with.
**Question 17: What document must be kept on-site regarding UST installation?
A. Employee handbook
B. As-built drawings
C. Fuel delivery invoices
D. Customer receipts
CORRECT ANSWER: B. As-built drawings
Rationale: As-built drawings document the actual installation location and configuration of the
UST system and must be retained.
**Question 18: Which agency must be notified immediately upon confirmation of a suspected
release?
A. Local Fire Department
B. Regional Water Quality Control Board
C. Department of Motor Vehicles
D. Local Utility Company
CORRECT ANSWER: B. Regional Water Quality Control Board
Rationale: Confirmed releases must be reported to the Regional Water Quality Control Board
within specific timeframes (often 24 hours).
**Question 19: What is the minimum depth of cover required over a UST?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
CORRECT ANSWER: B. 12 inches
Rationale: A minimum of 12 inches of cover is generally required to protect the tank from
surface loads and temperature fluctuations.
**Question 20: Which test verifies the integrity of the tank shell?
A. Cathodic protection test
B. Tightness test
