California Designated Operator Practice Exam

Primary piping in contact with hazardous substances must be installed in which system?

1. Regular underground trenches

2. Secondary containment systems

3. Open system

4. Directly in the ground

The correct answer is: Secondary containment systems

Primary piping that is in contact with hazardous substances needs to be installed within secondary containment systems to ensure safety and environmental protection. Secondary containment systems are designed to contain any potential leaks or spills from the primary piping, preventing hazardous substances from escaping into the surrounding environment. This is crucial for protecting groundwater and soil contamination, which can have serious health and ecological consequences. By using secondary containment, operators ensure that there is an additional layer of security beyond the primary piping. This is especially significant for transporting or storing hazardous materials, as it mitigates risks associated with potential piping failures, such as corrosion, mechanical damage, or operational errors. The design of secondary containment systems typically involves features like double-walled piping, trenches with impermeable barriers, or dedicated containment areas, all aimed at enhancing safety measures. Other options, such as regular underground trenches, open systems, or installing directly in the ground, do not provide the necessary safeguards against leaks and spills, as they lack the containment features that are essential for managing hazardous substances safely.