What is one of the actions you can take if a site fails?

The action of installing engineering controls is a valid response when a site fails because it provides a way to manage risks associated with contamination. Engineering controls can include physical barriers or systems designed to minimize exposure to hazardous substances, thereby protecting human health and the environment. They can be particularly important in remediating sites where the failure might indicate ongoing releases or elevated risks that require proactive measures to contain or mitigate.

Implementing engineering controls often reflects a commitment to not only address immediate concerns but also to ensure long-term safety and compliance with regulatory requirements. Such actions can prevent further degradation of the site and can also assist in securing funding or approvals for cleanup actions.

On the other hand, options like reassessing sampling locations, stopping cleanup operations, or increasing monitoring frequency may also be relevant in certain contexts, but they do not provide the direct intervention that engineering controls offer. Reassessing sampling might lead to better data, stopping operations can halt progress, and merely increasing monitoring would still leave the existing contamination risks unaddressed.