What should be done immediately if any leak is indicated on the CGI?

When a leak is indicated on the combustible gas indicator (CGI), it is crucial to notify the utility immediately. This is because a gas leak poses significant safety hazards that can lead to serious incidents such as explosions or health risks from inhalation. Promptly notifying the utility ensures that trained professionals can respond to the situation and take appropriate measures to isolate the leak and mitigate any risks to occupants and the surrounding environment. This immediate action aligns with safety protocols and regulations designed to protect both individuals and property from the dangers associated with gas leaks.

The other choices may seem plausible but do not prioritize safety effectively. Ignoring the leak could exacerbate an already dangerous situation, while documenting it for future reference could delay immediate action. Sealing the area and leaving might protect the inspector temporarily but does not address the leak itself, leaving it unmitigated and posing risks to others. Therefore, notifying the utility is the most responsible and safety-conscious action to take when a gas leak is detected.