A Drip Under a CORROSIVE Placard
You are hauling 3,200 lb of sulfuric acid in four 800-lb totes on a 26,000-lb GVWR straight truck. The truck is placarded CORROSIVE on both sides and both ends, and the shipping papers are in the required pouch. You carry an Emergency Response Guidebook. At a crowded truck stop 25 miles from the consignee, you notice a drip from the bottom valve of one tote onto the aluminum deck. The wet patch is about the size of a dime. The temperature is 34°F and light rain is falling; the deck is wet in places. You have 45 minutes before your appointment. The shipper’s paperwork says the material is 98% sulfuric acid, UN1830, Class 8, Packing Group II.
1. What are your immediate actions, and should you continue to the consignee?
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Treat the drip as a hazardous materials release until you prove otherwise. Do not continue to the consignee. Park away from fuel pumps, crowds, and drains; set the parking brake; shut off the engine; and keep ignition sources away. Put on the personal protective equipment required for a Class 8 corrosive, contain the drip with a spill kit if you have one, and keep other people back. Use the shipping paper and the Emergency Response Guidebook to identify the hazards, and check the tote valve and the deck to see whether the liquid is acid or rainwater. A 45-minute appointment is not a reason to move a leaking corrosive load. The safe decision is to stop, contain, and notify rather than risk a larger spill on the road.
2. Who should be notified, and what information should you have ready?
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Notify your employer and the shipper or consignee as required by your company’s emergency response plan. If the release is a reportable quantity, is continuing, or creates a fire, injury, or public threat, call 911 and the National Response Center. For sulfuric acid, the reportable quantity is 1,000 lb, so a dime-sized drip is not automatically an RQ release, but a continuing leak could become one. Have the shipping paper information ready: UN1830, sulfuric acid, Class 8, Packing Group II, 3,200 lb, plus the placard information and your location. Describe what is leaking, how much you can see, and whether anyone is injured. Accurate information helps responders choose the right PPE and containment.
3. What if the drip turns out to be rainwater running off the tote?
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You still must verify before moving. Wipe the area dry, watch the valve and the tote bottom for several minutes, and check for wetness that reappears. Rainwater can mask an acid leak and dilute it, making the hazard less obvious. If the source is clearly rainwater and the tote and valve are dry after rechecking, document what you found and continue only after confirming the load is secure. If there is any doubt, treat it as a leak. The judgement point is that “probably rainwater” is not a diagnosis; the driver needs evidence from the equipment, not from the weather.