ICC- U1 UNDERGROUND STORAGE TANK INSTALLER EXAM – QUESTIONS AND
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | LATEST EXAM UPDATE
*Core Domains*
*Pre-Installation Planning*
*Excavation and Backfill*
*Tank Handling and Testing*
*Piping Installation and Secondary Containment*
*Overfill and Spill Prevention*
*Corrosion Protection Systems*
*Leak Detection Methods*
*Decommissioning*
*Safety and Compliance*
*Introduction*
The purpose of this examination is to evaluate the competency of individuals seeking
certification as Underground Storage Tank (UST) Installers. This assessment focuses on
the technical proficiency required to safely install, modify, and repair UST systems in
accordance with federal and local regulatory standards. The questions are structured as a
combination of theoretical knowledge and complex, scenario-based applications.
,Candidates will be assessed on their ability to interpret site plans, implement spill
prevention measures, and ensure environmental safety during mechanical operations.
Success requires a deep understanding of structural integrity, pressure testing, and real-
world decision-making under strict safety guidelines.
SECTION ONE
1. What is the minimum required depth of bedding material that must be placed in the
bottom of the tank excavation before the tank is set?
A. 3 inches
B. 6 inches
C. 12 inches
D. 24 inches
🟢 B. 6 inches
🔴 Explanation: Standard industry practice and regulatory guidelines typically require a
minimum of 6 inches of compacted bedding material to provide uniform support for the
tank.
, 2. When using pea gravel as a backfill material, what is the maximum allowable
percentage of fines passing through a #200 sieve?
A. 1%
B. 3%
C. 5%
D. 10%
🟢 A. 1%
🔴 Explanation: To ensure proper drainage and structural stability, pea gravel used for
UST backfill must be clean and free-flowing, with minimal fines to prevent settling.
3. Which of the following is the primary purpose of a "ballfloat" valve in a UST system?
A. Leak detection
B. Suction line filtration
C. Overfill protection
D. Venting restriction
🟢 C. Overfill protection
🔴 Explanation: A ballfloat valve is a type of overfill prevention device that restricts the
flow of product into the tank once it reaches a certain capacity, usually 90%.
, 4. During a pre-installation air test on a double-walled fiberglass tank, what is the
standard maximum pressure applied to the primary tank?
A. 3 psig
B. 5 psig
C. 10 psig
D. 15 psig
🟢 B. 5 psig
🔴 Explanation: Manufacturers generally specify a maximum of 5 psig for air testing
primary tanks to prevent structural damage while checking for leaks during transit.
5. A contractor is installing a UST in an area with a high water table. What is the most
critical calculation needed to prevent tank "float-out"?
A. The total weight of the product
B. The pipe friction loss
C. The buoyancy force vs. the weight of backfill and anchors
D. The soil compaction ratio
🟢 C. The buoyancy force vs. the weight of backfill and anchors
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | LATEST EXAM UPDATE
*Core Domains*
*Pre-Installation Planning*
*Excavation and Backfill*
*Tank Handling and Testing*
*Piping Installation and Secondary Containment*
*Overfill and Spill Prevention*
*Corrosion Protection Systems*
*Leak Detection Methods*
*Decommissioning*
*Safety and Compliance*
*Introduction*
The purpose of this examination is to evaluate the competency of individuals seeking
certification as Underground Storage Tank (UST) Installers. This assessment focuses on
the technical proficiency required to safely install, modify, and repair UST systems in
accordance with federal and local regulatory standards. The questions are structured as a
combination of theoretical knowledge and complex, scenario-based applications.
,Candidates will be assessed on their ability to interpret site plans, implement spill
prevention measures, and ensure environmental safety during mechanical operations.
Success requires a deep understanding of structural integrity, pressure testing, and real-
world decision-making under strict safety guidelines.
SECTION ONE
1. What is the minimum required depth of bedding material that must be placed in the
bottom of the tank excavation before the tank is set?
A. 3 inches
B. 6 inches
C. 12 inches
D. 24 inches
🟢 B. 6 inches
🔴 Explanation: Standard industry practice and regulatory guidelines typically require a
minimum of 6 inches of compacted bedding material to provide uniform support for the
tank.
, 2. When using pea gravel as a backfill material, what is the maximum allowable
percentage of fines passing through a #200 sieve?
A. 1%
B. 3%
C. 5%
D. 10%
🟢 A. 1%
🔴 Explanation: To ensure proper drainage and structural stability, pea gravel used for
UST backfill must be clean and free-flowing, with minimal fines to prevent settling.
3. Which of the following is the primary purpose of a "ballfloat" valve in a UST system?
A. Leak detection
B. Suction line filtration
C. Overfill protection
D. Venting restriction
🟢 C. Overfill protection
🔴 Explanation: A ballfloat valve is a type of overfill prevention device that restricts the
flow of product into the tank once it reaches a certain capacity, usually 90%.
, 4. During a pre-installation air test on a double-walled fiberglass tank, what is the
standard maximum pressure applied to the primary tank?
A. 3 psig
B. 5 psig
C. 10 psig
D. 15 psig
🟢 B. 5 psig
🔴 Explanation: Manufacturers generally specify a maximum of 5 psig for air testing
primary tanks to prevent structural damage while checking for leaks during transit.
5. A contractor is installing a UST in an area with a high water table. What is the most
critical calculation needed to prevent tank "float-out"?
A. The total weight of the product
B. The pipe friction loss
C. The buoyancy force vs. the weight of backfill and anchors
D. The soil compaction ratio
🟢 C. The buoyancy force vs. the weight of backfill and anchors
