Withdrawal distance for 35,000 pounds of HC/D 1.1 explosives

• A. 4000 ft
• B. 2000 ft
• C. 6000 ft
• D. 800 ft

Answer: (A)

Withdrawal distance is the minimum safe distance you must keep from a high-explosive operation or storage when there’s a mass detonation hazard. For HC/D 1.1 explosives, this distance is laid out on quantity-distance charts that relate how much explosive you have to how far blast effects can reach.

With 35,000 pounds, the chart point falls at about four thousand feet. This distance is chosen to protect personnel from blast overpressure and flying debris if a detonation occurs, ensuring you’re far enough away to stay out of the most dangerous zone. The other distances would correspond to different amounts of explosive and don’t match the quantity given here.