According to EPA regulations, what is the required quantity of chlorine gas that mandates a utility to have a "Risk Management Plan"?

The correct answer regarding the quantity of chlorine gas that requires a utility to have a "Risk Management Plan" is 2500 lbs. According to the EPA’s Risk Management Program (RMP) regulations, facilities that handle certain hazardous substances, including chlorine, must develop and implement a risk management plan if they possess a quantity that meets or exceeds specified thresholds.

For chlorine gas, the threshold quantity is set at 2500 lbs. This requirement is in place to ensure that utilities that handle significant amounts of hazardous substances have plans in place to manage potential risks to public health and the environment. Such a plan includes the identification of hazards, an assessment of the potential impacts of accidental releases, and the development of a strategy to mitigate those impacts.

The thresholds for other substances listed in the options are higher and would not trigger the requirement for a risk management plan under existing regulations. Thus, any utility possessing chlorination equipment or in the process of using chlorine gas at or above the 2500 lbs mark must adhere to these regulations, making safety a priority.