OSFM HAZMAT State Exam with Questions and Answers

OSFM HAZMAT State Exam with Questions and Answers A leaking pressurized chlorine cylinder is found in a loading dock with active vapor release. The technician determines that immediate aggressive intervention is required. Which action is the MOST appropriate advanced offensive tactic to reduce product release while maintaining responder safety? a. Apply a water stream directly into the valve outlet to dilute the chlorine release b. Use a vapor suppression technique with water fog while initiating remote valve closure procedures c. Establish a large isolation zone and wait for the cylinder to self-seal through pressure equalization d. Apply Class B foam over the cylinder to fully encapsulate and seal the leak Correct Answer b Rationale Water fog can help knock down chlorine vapors while reducing downwind hazard, and remote or indirect valve closure is an offensive but controlled intervention. This balances mitigation with responder safety. Direct water streams can worsen dispersion or reaction, foam is ineffective for chlorine gas control, and passive waiting is not an offensive technician-level tactic.