What is the maximum containment level set by regulations for USTs?

The correct answer highlights the regulatory approach to managing contaminants in underground storage tanks (USTs). Specific thresholds for contaminants are established to mitigate the risk of environmental harm and to protect public health. These thresholds are determined based on various factors, such as the type of contaminant, local soil and water characteristics, and potential sources of exposure.

Regulatory bodies set these maximum containment levels to ensure that UST operators are complying with safety standards and preventing leaks or spill incidents that could contaminate soil and groundwater. By adhering to these specific limits, UST systems can effectively reduce the potential negative environmental impacts while still allowing for the operation of the storage tanks within safe parameters.

This approach recognizes the complexity of contamination risks and provides a structured method for monitoring and managing potential pollutants rather than requiring a zero-contaminant scenario, which may not be practical or achievable in all circumstances.