What are the notification obligations if the average respirable dust concentration exceeds stated levels?

• A. CMWs within 24 hours; Inspector within 72 hours; Chief Inspector within 72 hours
• B. Notify only the manager within 7 days
• C. No notification required
• D. Post on bulletin board

Answer: (A)

When respirable dust levels exceed the stated limit, there are clear, time-bound notification duties to protect workers and enable regulatory action. The rule requires informing the coal mine workers within 24 hours so everyone exposed is aware and can take protective steps. It also requires notifying the Inspector within 72 hours and the Chief Inspector within 72 hours, ensuring regulators are promptly alerted to the exceedance and can oversee appropriate corrective actions.

Other options don’t meet these obligations because they either don’t notify all affected parties, omit the regulator notifications, or delay communication beyond the required timeframes.