Contractor License Practice Exam

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Prepare for the Contractor License Exam with comprehensive quizzes. Study with multiple choice questions, flashcards, and detailed explanations to ensure you're ready for success on exam day!

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What percentage of its volume must a tank have underground to be classified as an underground storage tank?

The correct answer is: 10%

To be classified as an underground storage tank (UST), a tank must have at least 10% of its volume located underground. This definition is used to determine regulatory compliance and safety conditions concerning the potential for leaks and environmental impact. The reasoning for setting this threshold at 10% is based on the understanding that even a small portion of the tank’s capacity being underground can significantly affect how it interacts with the surrounding soil and groundwater. The classification is critical because tanks that partially or fully meet this criterion are subject to specific regulations and monitoring standards aimed at preventing environmental contamination. Understanding this percentage assists contractors and regulatory personnel in identifying which tanks need oversight and compliance with appropriate laws focused on environmental protection.