The Chemical Drum in the Garage
You attend a residential fire that is out on arrival. In the garage, a 200 L drum has split and a clear liquid is pooling; there is a strong solvent smell, and vapours are visible as a shimmer near the floor. The drum label is partly burnt but shows a diamond with a red top section. The garage is attached to the house and shares a door with the laundry. The homeowner says the drum is "just parts washer fluid" and wants to hose it out to the drain. Two children are in the front yard, and the wind is blowing vapours toward the house.
1. What is the hazard and what do you do first?
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Hazard: a flammable liquid (red diamond = flammability) with a large surface area, producing a vapour cloud that can travel to an ignition source and flash back. The garage is attached, so vapours can enter the house; the drain would carry the product to the environment and possibly to a confined space.
First actions:
- Do not hose it into the drain. That spreads the hazard and creates a pollution incident.
- Control ignition sources: no smoking, no engines, no electrical switching in the garage; isolate power to the garage if safe.
- Evacuate and cordon: move the children and the homeowner upwind and away; keep people out of the vapour path.
- Call for hazmat advice and confirm the product from the label or the homeowner before any clean-up.
- Use BA and appropriate gloves if you must approach; do not kneel in the pool.
2. How do you stop the vapour and contain the spill?
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- Stop the source: upright the drum or plug/overpack the split if it can be done safely; otherwise leave it and contain.
- Contain: dam the pool with earth, sand, or a spill kit and absorbent material, keeping it away from the drain and the laundry door. Do not use water to dilute.
- Suppress vapour: a fine water spray may be used as a protective curtain by trained crews, but it does not fix the spill and must not flush it.
- Ventilate the garage only after the source is controlled and ignition sources are managed, and only in a way that does not push vapour into the house.
- Protect the drain with a drain seal or sandbags before anything else.
3. The homeowner insists on cleaning it up himself. What do you do?
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- Refuse to let him work in the vapour - he lacks PPE and the vapour is flammable and toxic.
- Explain the risk in plain terms: the vapour can ignite from a spark or a light switch, and the drain would spread it.
- Keep him and the children upwind and out of the garage.
- Hand the clean-up to the hazmat crew and record the product details for them.
- If he persists, escalate to your officer and police if necessary; your duty is to prevent a secondary incident, not to negotiate a clean-up.