If no contamination is observed in a tank pit and water enters the excavation, what is required?

If no contamination is observed in a tank pit and water enters the excavation, it is essential to collect at least one water sample. This is important because even in the absence of visible contamination, the presence of water can introduce various risks, including the potential for contaminants to migrate or for previously undetected contaminants to be present. Collecting a water sample allows for analysis that can identify whether any harmful substances are present that could pose a risk to the environment or public health.

Sampling the water also serves as a precautionary measure to ensure that if there are contaminants, they are detected early and addressed appropriately. It is a fundamental part of maintaining compliance with environmental regulations and ensuring safe practices in the management of underground storage tanks.