California Designated Operator Practice Exam

A monitoring program for new underground storage tanks should include which type of monitoring?

1. Continuous online monitoring only

2. Visual or mechanical monitoring of the interstitial space

3. Monthly inspection reports

4. Only visual inspections

The correct answer is: Visual or mechanical monitoring of the interstitial space

The monitoring program for new underground storage tanks should incorporate visual or mechanical monitoring of the interstitial space. This is critical because the interstitial space refers to the area between the primary tank and its secondary containment. By monitoring this space, operators can detect leaks or breaches that may occur in the tank system. Mechanical monitoring can include the use of devices that provide alarms or alerts when fluid is detected in the interstitial space, indicating a leak. Visual monitoring is also essential, as it allows operators to routinely inspect the containment area for any visible signs of leaks or damage. Regular assessments of the interstitial space ensure that any potential issues are identified early, thus minimizing environmental risks and ensuring compliance with regulations. The other monitoring methods, while potentially useful, do not provide the comprehensive oversight needed for underground storage tanks. Continuous online monitoring focuses solely on real-time data, which may overlook certain types of leaks that could be detected through visual or mechanical means. Monthly inspection reports could miss immediate issues that need addressing, and relying only on visual inspections doesn’t provide the thoroughness that mechanical monitoring offers in detecting leaks. Therefore, visual or mechanical monitoring of the interstitial space is the most effective strategy for a monitoring program.