U1: UST Installation and Retrofitting
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
1. A bottom hold-down pad for a tank is typically constructed of:
A. 2" gravel
B. 4" asphalt
C. 8" reinforced concrete
D. Compacted sand only
Rationale: A reinforced concrete pad provides a rigid base to which hold-down
straps anchor, which counters buoyancy from groundwater.
2. Aboveground piping should be Schedule ____ galvanized or painted/coated
black steel pipe.
A. 10
B. 20
C. 40
D. 80
Rationale: Schedule 40 is the standard minimum wall thickness for steel piping in
fuel systems.
3. All piping components, including fittings, gaskets, O-rings, pipe dope, and the
piping itself, must: (Select all that apply)
A. Be fully compatible with the products stored and the underground
,environment
B. Have sufficient strength to withstand the stress produced during construction
C. Be the cheapest available option
D. Be made by a single manufacturer only
Rationale: Incompatible materials can swell, leak, or corrode, and weak
components can fail during installation.
4. Electrical isolation material on tank straps for steel and composite tanks
should be at least how thick, wider than the strap, and extend how far below
the widest part of the tank?
A. 1/16 inch; 6 inches
B. 1/8 inch; 1 foot
C. 1/4 inch; 2 feet
D. 1/2 inch; 3 feet
Rationale: Isolation prevents the strap from creating a galvanic corrosion cell with
a steel tank.
5. Flex connectors are not required on flexible pipe. True or False?
A. True
B. False
Rationale: Flex connectors are still required where piping connects to tanks and
dispensers to absorb movement, settling, and vibration.
6. Flex connectors installed in dispenser or intermediate sumps should be listed
for ____ use.
A. Underground
B. Submerged only
,C. Aboveground
D. Any use
Rationale: Dispenser and intermediate sumps are not buried in soil, so
aboveground-listed connectors are used.
7. Flex connectors installed in tank-top sumps should be listed for:
A. Aboveground use only
B. Underground use only
C. Aboveground or underground use
D. Vapor use only
Rationale: Tank-top sumps may contain product or be exposed to groundwater, so
either listing is acceptable.
8. Groundwater monitoring wells should be built with 0.020-inch openings and
permeable backfill so water or released product flows freely. Which materials
are acceptable? (Select all that apply)
A. Slotted PVC
B. Perforated PVC
C. Coated metal pipe
D. Solid steel with no openings
Rationale: The well must allow free flow of water and any released product so a
leak can be detected.
9. Installing steel unions underground is not recommended. If unavoidable,
what should be used?
A. Threaded unions with no access
B. Plastic unions
, C. Ground joint unions rated 250/300#, with access provided for service
D. Welded unions only
Rationale: Ground joint unions are more reliable, and access allows inspection and
repair.
10. Prior to installing a UST, piping, or other UST system equipment, what should
be done? (Select all that apply)
A. Physically inspect all materials for defects, and notify the owner and repair
per the manufacturer’s directions, if defects are found
B. Confirm adherence to the plans and specifications
C. Install first and inspect later
D. Skip inspection if the equipment is new
Rationale: Catching defects before burial prevents costly and hazardous repairs
later.
11. Roofing felt and expansion joint material are acceptable for isolating tank
straps from a steel tank. True or False?
A. True
B. False
Rationale: These materials degrade, absorb water, and compress, so they do not
provide reliable electrical isolation.
12. Which statements about tank straps are true? (Select all that apply)
A. They are usually furnished by the tank manufacturer
B. Straps for steel tanks should be either non-metallic or flat steel
C. Metallic anchor straps should be heavier than initially required to allow for
corrosion
D. Any wire rope may be used
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
1. A bottom hold-down pad for a tank is typically constructed of:
A. 2" gravel
B. 4" asphalt
C. 8" reinforced concrete
D. Compacted sand only
Rationale: A reinforced concrete pad provides a rigid base to which hold-down
straps anchor, which counters buoyancy from groundwater.
2. Aboveground piping should be Schedule ____ galvanized or painted/coated
black steel pipe.
A. 10
B. 20
C. 40
D. 80
Rationale: Schedule 40 is the standard minimum wall thickness for steel piping in
fuel systems.
3. All piping components, including fittings, gaskets, O-rings, pipe dope, and the
piping itself, must: (Select all that apply)
A. Be fully compatible with the products stored and the underground
,environment
B. Have sufficient strength to withstand the stress produced during construction
C. Be the cheapest available option
D. Be made by a single manufacturer only
Rationale: Incompatible materials can swell, leak, or corrode, and weak
components can fail during installation.
4. Electrical isolation material on tank straps for steel and composite tanks
should be at least how thick, wider than the strap, and extend how far below
the widest part of the tank?
A. 1/16 inch; 6 inches
B. 1/8 inch; 1 foot
C. 1/4 inch; 2 feet
D. 1/2 inch; 3 feet
Rationale: Isolation prevents the strap from creating a galvanic corrosion cell with
a steel tank.
5. Flex connectors are not required on flexible pipe. True or False?
A. True
B. False
Rationale: Flex connectors are still required where piping connects to tanks and
dispensers to absorb movement, settling, and vibration.
6. Flex connectors installed in dispenser or intermediate sumps should be listed
for ____ use.
A. Underground
B. Submerged only
,C. Aboveground
D. Any use
Rationale: Dispenser and intermediate sumps are not buried in soil, so
aboveground-listed connectors are used.
7. Flex connectors installed in tank-top sumps should be listed for:
A. Aboveground use only
B. Underground use only
C. Aboveground or underground use
D. Vapor use only
Rationale: Tank-top sumps may contain product or be exposed to groundwater, so
either listing is acceptable.
8. Groundwater monitoring wells should be built with 0.020-inch openings and
permeable backfill so water or released product flows freely. Which materials
are acceptable? (Select all that apply)
A. Slotted PVC
B. Perforated PVC
C. Coated metal pipe
D. Solid steel with no openings
Rationale: The well must allow free flow of water and any released product so a
leak can be detected.
9. Installing steel unions underground is not recommended. If unavoidable,
what should be used?
A. Threaded unions with no access
B. Plastic unions
, C. Ground joint unions rated 250/300#, with access provided for service
D. Welded unions only
Rationale: Ground joint unions are more reliable, and access allows inspection and
repair.
10. Prior to installing a UST, piping, or other UST system equipment, what should
be done? (Select all that apply)
A. Physically inspect all materials for defects, and notify the owner and repair
per the manufacturer’s directions, if defects are found
B. Confirm adherence to the plans and specifications
C. Install first and inspect later
D. Skip inspection if the equipment is new
Rationale: Catching defects before burial prevents costly and hazardous repairs
later.
11. Roofing felt and expansion joint material are acceptable for isolating tank
straps from a steel tank. True or False?
A. True
B. False
Rationale: These materials degrade, absorb water, and compress, so they do not
provide reliable electrical isolation.
12. Which statements about tank straps are true? (Select all that apply)
A. They are usually furnished by the tank manufacturer
B. Straps for steel tanks should be either non-metallic or flat steel
C. Metallic anchor straps should be heavier than initially required to allow for
corrosion
D. Any wire rope may be used
