Oregon Construction Contractors (CCB) Practice Test

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A UST is defined as a tank with at least what percent of its combined volume underground?

  1. 5 percent

  2. 10 percent

  3. 15 percent

  4. 25 percent

The correct answer is: 10 percent

A UST, or Underground Storage Tank, is defined as a tank that has at least 10 percent of its combined volume located underground. This specific threshold is outlined in regulations to ensure that systems used for storing hazardous substances meet safety and environmental standards. By setting the definition at 10 percent, regulatory bodies can effectively categorize and monitor these tanks, promoting safety measures that protect the surrounding environment from potential leaks or spills. This definition helps establish the parameters for regulatory oversight and compliance, ensuring that tanks that do not meet this requirement are treated differently regarding monitoring, maintenance, and reporting obligations. Understanding this benchmark is crucial for contractors and professionals in the field, as it directly relates to regulatory compliance and environmental protection measures.