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ICC U2 UST Decommissioning Exam Prep – 150 Questions & Answers on UST Removal, Safety, Vapor Testing | ICC Certification 2026

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This document is a comprehensive study resource for the ICC U2 Underground Storage Tank (UST) Decommissioning certification exam, containing 150 practice questions and verified answers designed to help candidates prepare for licensing and technical competency assessments. The material covers essential procedures involved in underground storage tank removal, closure in place, vapor purging, tank cleaning, safety precautions, and environmental compliance requirements. The questions simulate real certification exam scenarios and focus on both technical knowledge and regulatory understanding required for professionals involved in UST decommissioning projects. The document provides detailed coverage of critical topics such as petroleum vapor hazards, combustible gas indicator (CGI) testing, fire triangle principles, flash point and ignition temperature concepts, tank purging methods, excavation safety requirements, and procedures for safely removing or abandoning underground storage tanks. It also includes regulatory compliance questions related to EPA underground storage tank regulations, California Code of Regulations Title 23, leak detection requirements, cathodic protection systems, monitoring equipment certification, and spill containment testing. These topics reflect real operational responsibilities faced by environmental contractors, tank removal specialists, inspectors, and compliance professionals. In addition, the study material explains key technical concepts used in the petroleum storage and environmental safety industry, including specific gravity, vapor pressure, viscosity, interstitial monitoring, enhanced leak detection (ELD), secondary containment systems, and underground storage tank system components. Safety-focused questions also address exposure risks to petroleum hydrocarbons such as benzene and toluene, confined space considerations, ventilation methods, and proper procedures for handling flammable vapors during tank removal operations. The content is closely aligned with standards and regulatory frameworks commonly referenced in ICC certification preparation, including EPA UST regulations (40 CFR Part 280), OSHA safety principles, and California UST regulatory requirements. It also reflects procedures and technical guidelines discussed in the industry reference manual “Petroleum Equipment Institute Recommended Practices for Installation of Underground Liquid Storage Systems (PEI RP100)”, which is widely used in underground storage tank installation and removal training programs. This document may be particularly useful for students and professionals in the following programs or courses: ICC Underground Storage Tank (UST) Certification Training Environmental Engineering Technology programs Environmental Health and Safety (EHS) courses Hazardous Materials Management programs Petroleum Equipment Installation and Maintenance training Environmental Compliance and Regulatory Training courses Construction and Environmental Contractor Licensing programs It is intended for UST technicians, environmental contractors, petroleum equipment installers, environmental inspectors, safety officers, construction professionals, and students preparing for ICC UST certification exams, especially those studying underground storage tank removal procedures, regulatory compliance, and environmental safety practices. Keywords icc u2 ust decommissioning exam questions, ust removal certification prep, underground storage tank decommissioning practice questions, ust safety procedures exam prep, petroleum vapor hazards training, combustible gas indicator testing, ust closure in place procedures, underground tank removal safety, ust regulatory compliance exam prep, epa ust regulations study guide, california ust regulations title 23, enhanced leak detection eld test questions, interstitial monitoring ust systems, cathodic protection ust systems, spill containment testing ust, petroleum hydrocarbon safety training

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ICC U2 UST Decommissioning
2026 Exam Questions and
Verified Answers | Already
Graded A+



1. Under ground _______________ storage systems are not longer

needed or suitable for product storage must be properly disposed of

properly - 🧠ANSWER ✔✔A. Gas


B. Oil

,C. Petroleum

D. All of the above

Answer. C

2. All work that is completed at the site must be accomplished in

accordance with federal, state, and local requirements as well as accepted

safety standards. - 🧠ANSWER ✔✔A. True


B. False

Answer: True.

3. All applicable permits must be obtained prior to beginning any work. -

🧠ANSWER ✔✔A. True


B. False

Answer True.

4. What is the hazard that removers of petroleum tanks are faced with,

dangers such as petroleum hydrocarbon liquids vapor, or waste. -

🧠ANSWER ✔✔List three


____________ ______________ _______________

,5. What are some syntomes of inhaling or obsorbing high levels of

petroleum hydorocarbon vapors. - 🧠ANSWER ✔✔List three




_____________ _______________ ____________

Dizziness excitement, unconsciousness


6. Artificial resporation should be applied if - 🧠ANSWER ✔✔A. They hit

their head

B. They cant see

C. They have stopped breathing

D. They suffer from cardiac arrest

AnswerC

7. What are three parts of the body should Petroleum liquids be kept away

from an example would be eyes, skin and moulth. - 🧠ANSWER ✔✔List

three




_____________ _________________ ______________




3
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STATEMENT. ALL RIGHTS RESERVED

, 8. Hiogh ocupational exposures to benezene have been associated with

various human blood disorders - 🧠ANSWER ✔✔True/False


AnswerTrue

9. Smoking matterials or any flamable materials must be reamoved from

the job site in order to prevent - 🧠ANSWER ✔✔A. People from smoking


B. Sudden compution

C. Second hand smoke

D. Exploshins indide of tanks due to large amounts of vapor

E. B and D

Answer E

10. What tool with the abbreviation CGI should be used to check for

hazardous vapor concentrations. - 🧠ANSWER

✔✔_____________________________________


Answer: Combustible gas indicator

11. All tools that are in areas with hazardous vapor concentartions should

be shut down or they should be ________________ proof. - 🧠ANSWER

✔✔__________________

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