California ICC UST Inspector Practice Exam

What must be done if substances in the same tank can create flammable, toxic, or poisonous gases?

1. Ensure continuous ventilation

2. Store in the same containment

3. Separate substances in primary and secondary containment

4. Obtain safety inspections every month

The correct answer is: Separate substances in primary and secondary containment

The correct approach is to separate substances in primary and secondary containment to prevent any potential reactions that could produce flammable, toxic, or poisonous gases. When different substances are stored together, particularly in a tank, there is an inherent risk that they may react adversely. By using separate containment methods, you can significantly mitigate these risks, providing a layer of safety that ensures each substance is managed appropriately, preventing any chance of a dangerous reaction occurring. Isolating hazardous materials in different containers allows for better monitoring of each individual substance and reduces the likelihood of cross-contamination, which can lead to the creation of harmful gases. Secondary containment has the added benefit of capturing leaks or spills that might occur, further enhancing safety measures. Other approaches, while they may contribute to a safer environment, do not address the fundamental need for separation as effectively. Continuous ventilation, for instance, is important for managing vapors and fumes; however, it does not prevent the initial reaction between substances. Storing substances in the same containment increases the risk of interaction, and relying solely on monthly safety inspections does not substitute for immediate preventative measures like separation.