Which of the following is NOT a likely cause of a hazardous substance accident?

Following standard operating procedures is considered a best practice in hazardous waste operations and is designed to prevent accidents from occurring. Adhering to these procedures helps ensure that all safety protocols are followed, equipment is properly maintained, and employees are trained to respond effectively to potential hazardous situations. In contrast, broken or rusted pipes, faulty valves or transfer hoses, and leaking tanks are physical conditions that can lead to accidents if not properly mitigated. When standard operating procedures are in place and followed, they significantly reduce the likelihood of incidents involving hazardous substances. Thus, this option is not a likely cause of an accident.