As an intermediate precautionary measure, I should isolate the leak area in all directions for 50 metres(150 feet).
These manuals advise a 150-foot initial isolation in all directions. Responders should always strive to position themselves uphill, upwind, and upstream of the incident when responding to a scene involving hazardous materials.
Small spills (less than 52.83 gallons, or 200 litres): 100 feet in all directions should be isolated first (30 m). then during the day, safeguard those who are downwind: 0.2 mi (0.2 km). then throughout the night, safeguard those who are downwind: 0.8 mi (1.2 km).
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