ICC CALIFORNIA UST SERVICE
TECHNICIAN EXAM NEWEST 2026 TEST
BANK| 2 VERSIONS (VERSION A & B)
WITH COMPLETE 500 REAL EXAM
QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!
1. According to California regulations (Title 23, CCR), what is the
minimum wall thickness for new steel USTs?
A. 0.25 inches
B. 0.1875 inches
C. 0.125 inches
D. 0.10 inches
Rationale: The correct answer is B. 0.1875 inches. California Code of
Regulations Title 23, §2631(a) requires new steel tanks to have a
minimum shell thickness of 3/16 inch (0.1875"). This is a specific
California requirement that exceeds some federal standards.
2. When installing cathodic protection on a steel UST, what is the
minimum requirement for electrical isolation?
A. 500 ohms
B. 1,000 ohms
C. 10,000 ohms
D. 100,000 ohms
,Rationale: The correct answer is B. 1,000 ohms. Per California
regulations (§2632), tanks must be electrically isolated from the
environment with a minimum resistance of 1,000 ohms to ensure proper
cathodic protection function and measurement accuracy.
3. Which of the following leak detection methods is NOT approved
for monthly monitoring of pressurized piping in California?
A. Automatic line leak detector
B. Monthly vapor monitoring
C. Annual line tightness test
D. Continuous interstitial monitoring
Rationale: The correct answer is C. Annual line tightness test.
California requires monthly leak detection for pressurized piping.
Annual testing (C) doesn't meet the monthly requirement. Approved
methods include automatic line leak detectors (A), monthly vapor
monitoring (B) with specific calibration, and continuous interstitial
monitoring (D) for double-walled systems.
4. What is the maximum allowable settling period after UST
installation before tightness testing can be performed?
A. 4 hours
B. 24 hours
C. 72 hours
D. 7 days
Rationale: The correct answer is B. 24 hours. Per PEI RP1200 and
California requirements, newly installed tanks must be allowed to settle
for at least 24 hours before tightness testing to ensure accurate results.
Testing too soon can cause false failures due to system stabilization.
5. The required overfill prevention device for a tank receiving
product at 25 gallons per minute must activate at what percentage
of capacity?
A. 80%
B. 90%
,C. 95%
D. 100%
Rationale: The correct answer is B. 90%. For delivery flows ≤ 50 gpm,
California requires overfill prevention devices to activate at 90% of tank
capacity. For flows > 50 gpm, it's 85%. This is specified in §2631(f) and
NFPA 30.
6. What is the minimum burial depth for USTs in California unless
otherwise protected?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: The correct answer is B. 12 inches. Section 2631(d) requires
tanks to be buried with at least 12 inches of cover unless additional
protection is provided. This prevents damage from surface activities and
provides thermal stability.
7. When must interstitial monitoring devices be tested for proper
operation?
A. Monthly
B. Annually
C. Every 3 years
D. Only at installation
Rationale: The correct answer is B. Annually. California regulations
(§2643) require annual testing of all leak detection equipment, including
interstitial monitoring devices, to ensure they are functioning correctly
and will detect releases.
8. What is the required holding time for a precision tank test (0.1
gph) according to California standards?
A. 1 hour
B. 3 hours
, C. 6 hours
D. 24 hours
Rationale: The correct answer is B. 3 hours. Precision tank testing at
the 0.1 gph leak rate requires a minimum 3-hour test duration per
California protocols and NFPA 329 to ensure statistical accuracy and
account for temperature effects.
9. Which material is NOT approved for secondary containment
sumps under California regulations?
A. Fiberglass
B. Steel
C. Polyethylene
D. Untreated concrete
Rationale: The correct answer is D. Untreated concrete. California
requires secondary containment materials to be compatible with stored
substances and non-corrosive. Untreated concrete is porous and can
degrade from petroleum contact. Approved materials include coated
steel, fiberglass, and polyethylene.
10. When performing a line test on suction piping, what is the
minimum test pressure required?
A. 5 psi
B. 10 psi
C. 25 psi
D. 50 psi
Rationale: The correct answer is C. 25 psi. Per California testing
protocols, suction piping must be tested at 25 psi for 30 minutes, even
though operating pressure is lower. This ensures integrity under
potential overpressure conditions.
11. What information must be recorded on the permanent UST
installation tag in California?
A. Tank capacity only
B. Installer's name and date only
TECHNICIAN EXAM NEWEST 2026 TEST
BANK| 2 VERSIONS (VERSION A & B)
WITH COMPLETE 500 REAL EXAM
QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!
1. According to California regulations (Title 23, CCR), what is the
minimum wall thickness for new steel USTs?
A. 0.25 inches
B. 0.1875 inches
C. 0.125 inches
D. 0.10 inches
Rationale: The correct answer is B. 0.1875 inches. California Code of
Regulations Title 23, §2631(a) requires new steel tanks to have a
minimum shell thickness of 3/16 inch (0.1875"). This is a specific
California requirement that exceeds some federal standards.
2. When installing cathodic protection on a steel UST, what is the
minimum requirement for electrical isolation?
A. 500 ohms
B. 1,000 ohms
C. 10,000 ohms
D. 100,000 ohms
,Rationale: The correct answer is B. 1,000 ohms. Per California
regulations (§2632), tanks must be electrically isolated from the
environment with a minimum resistance of 1,000 ohms to ensure proper
cathodic protection function and measurement accuracy.
3. Which of the following leak detection methods is NOT approved
for monthly monitoring of pressurized piping in California?
A. Automatic line leak detector
B. Monthly vapor monitoring
C. Annual line tightness test
D. Continuous interstitial monitoring
Rationale: The correct answer is C. Annual line tightness test.
California requires monthly leak detection for pressurized piping.
Annual testing (C) doesn't meet the monthly requirement. Approved
methods include automatic line leak detectors (A), monthly vapor
monitoring (B) with specific calibration, and continuous interstitial
monitoring (D) for double-walled systems.
4. What is the maximum allowable settling period after UST
installation before tightness testing can be performed?
A. 4 hours
B. 24 hours
C. 72 hours
D. 7 days
Rationale: The correct answer is B. 24 hours. Per PEI RP1200 and
California requirements, newly installed tanks must be allowed to settle
for at least 24 hours before tightness testing to ensure accurate results.
Testing too soon can cause false failures due to system stabilization.
5. The required overfill prevention device for a tank receiving
product at 25 gallons per minute must activate at what percentage
of capacity?
A. 80%
B. 90%
,C. 95%
D. 100%
Rationale: The correct answer is B. 90%. For delivery flows ≤ 50 gpm,
California requires overfill prevention devices to activate at 90% of tank
capacity. For flows > 50 gpm, it's 85%. This is specified in §2631(f) and
NFPA 30.
6. What is the minimum burial depth for USTs in California unless
otherwise protected?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: The correct answer is B. 12 inches. Section 2631(d) requires
tanks to be buried with at least 12 inches of cover unless additional
protection is provided. This prevents damage from surface activities and
provides thermal stability.
7. When must interstitial monitoring devices be tested for proper
operation?
A. Monthly
B. Annually
C. Every 3 years
D. Only at installation
Rationale: The correct answer is B. Annually. California regulations
(§2643) require annual testing of all leak detection equipment, including
interstitial monitoring devices, to ensure they are functioning correctly
and will detect releases.
8. What is the required holding time for a precision tank test (0.1
gph) according to California standards?
A. 1 hour
B. 3 hours
, C. 6 hours
D. 24 hours
Rationale: The correct answer is B. 3 hours. Precision tank testing at
the 0.1 gph leak rate requires a minimum 3-hour test duration per
California protocols and NFPA 329 to ensure statistical accuracy and
account for temperature effects.
9. Which material is NOT approved for secondary containment
sumps under California regulations?
A. Fiberglass
B. Steel
C. Polyethylene
D. Untreated concrete
Rationale: The correct answer is D. Untreated concrete. California
requires secondary containment materials to be compatible with stored
substances and non-corrosive. Untreated concrete is porous and can
degrade from petroleum contact. Approved materials include coated
steel, fiberglass, and polyethylene.
10. When performing a line test on suction piping, what is the
minimum test pressure required?
A. 5 psi
B. 10 psi
C. 25 psi
D. 50 psi
Rationale: The correct answer is C. 25 psi. Per California testing
protocols, suction piping must be tested at 25 psi for 30 minutes, even
though operating pressure is lower. This ensures integrity under
potential overpressure conditions.
11. What information must be recorded on the permanent UST
installation tag in California?
A. Tank capacity only
B. Installer's name and date only
