In the event that a thunderstorm with visible lightning is approaching the site, the following steps should be followed to minimize the risk of personal injury:
(1) The supervisory staff on-site will determine when a storm is close enough for the lightning to pose a safety risk to the site personnel.
(2) Supervisory personnel will use the Flash/Bang (F/B) technique to help measure storm proximity.
(3) The F/B technique states that for every count of three from the time of seeing the lightning stroke to hearing the associated thunder, lightning is 1 km away. A F/B of 9 = 3 km (approx. 2 mi.); a F/B of 15 = 5 km (approx. 3 mi.), etc.
(4) Therefore, when thunder is heard and the F/B ratio is calculated to be 30 representing 10 km, supervisory personnel will inform field personnel of the potential for lightning in the area.
(5) If the F/B intensity increases to a value of 15, supervisory/safety personnel will suspend all crane hoisting and elevated work activities.
(6) If the F/B reaches a level of 9, the site shall be cleared.
(7) All personnel will return to their lunch trailers. Foreman will conduct a headcount and forward this information to the HSE department.
(8) All workers will remain in their trailers until a decision is reached regarding the return to work..
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