Which section of the ERG contains information regarding toxic cases produced when materials come in contact with water?

The correct answer is found in the Green section of the Emergency Response Guide (ERG), which specifically deals with toxic materials and their interactions with water. This section provides crucial information regarding how certain hazardous materials can react with water, potentially producing toxic gases or other dangerous effects. Understanding these interactions is vital for first responders, as it helps them assess the risk and determine the proper actions to take in response to a spill or leak involving hazardous substances.

The Green section effectively guides responders on how to safely manage situations where there is a risk of toxic exposure due to water contact, ensuring they can implement the necessary precautions to protect both themselves and the public. This knowledge is essential in formulating an effective response plan and mitigating any potential hazards during an emergency involving chemicals that have adverse effects when mixed with water.