What visual evidence must be present for an operator to notify the DEQ of a confirmed release upon removal of an UST?

The presence of visibly contaminated groundwater or soil is crucial for confirming a release from an underground storage tank (UST). This visual evidence indicates that a spill or leak has occurred, allowing contaminants to migrate into the surrounding environment. When an operator identifies visibly contaminated groundwater or soil, it signifies that hazardous materials have escaped from the tank, creating an immediate need to notify the Department of Environmental Quality (DEQ) for appropriate investigation and remediation.

This requirement aligns with regulatory protocols to ensure public health and environmental protection. The presence of visible contamination serves as the baseline for assessing the severity of a release and the necessary response actions that must be taken by regulatory authorities. Such evidence establishes a clear case of contamination that goes beyond mere suspicion or assumptions about potential releases, making it essential to take prompt action.