How far from the barricade should precautionary measures to prevent gases be implemented?

The correct answer is 50 feet because this distance is generally recognized as a safe boundary for precautionary measures to prevent exposure to potentially harmful gases and vapors, especially in construction or demolition areas. Beyond this distance, the concentration of gases tends to dissipate significantly, reducing the risk to workers and bystanders. This guideline is supported by various safety regulations and best practices that aim to protect individuals from health hazards associated with gas exposure.

Implementing safety measures at this distance ensures that personnel are adequately protected while still maintaining access to the worksite for necessary operations. It also allows for a sufficient buffer zone, enabling emergency responses if necessary while minimizing the risk of any accidents related to gas exposure.