The Missing UN Number on a Hazmat Load
You are a hazmat driver picking up a load at a warehouse. The shipper hands you a shipping paper for 400 lbs of a material described only as 'Corrosive liquid, n.o.s.' The paper lists the hazard class (8), packing group (II), and the total quantity, but the UN number and the technical name are illegible - smeared ink on the carbon copy. The shipper tells you the original is fine and that you can 'just go, it's the same thing.' The load is going 300 miles through two states. You have the DOT Emergency Response Guidebook and the shipper's SDS is available on request.
1. Can you legally and safely accept this shipping paper and depart? What must be true before the vehicle moves?
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No. A shipping paper for a hazardous material must show the UN identification number and the proper shipping name, and for an n.o.s. entry the technical name must appear in parentheses. The carbon copy in your possession is illegible, which means the document in the cab does not meet the communication requirements - the responder at an incident reads your copy, not the shipper's original. Before moving you must obtain a legible shipping paper (or a corrected copy) showing the UN number, proper shipping name, hazard class, packing group, and total quantity, plus the shipper's certification. Do not rely on the SDS as a substitute for the shipping paper; the SDS is a worker-safety document, not a DOT shipping document. If the shipper cannot produce a compliant paper, you leave the load behind.
2. How does the illegibility affect the placarding decision, and what is your reasoning?
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Placarding is driven by the hazard class and quantity actually loaded, not by whether the paper is pretty. Class 8 liquid, PG II, at 400 lbs (roughly 181 kg) - you must check the placarding table threshold for that material. If the quantity meets the 1,001-lb aggregate threshold for Table 2 materials, the vehicle needs CORROSIVE placards. The point for the exam: the illegible paper doesn't change the placard requirement, but it does prevent you from verifying the class and quantity you're placarding against. You cannot placard correctly from a document you can't read. Resolve the paper first, confirm the class and weight, then placard to match.
3. The shipper says 'it's the same thing, just go.' What is your judgment call, and what do you document?
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Decline and hold. You are the last line of defense before this material enters the highway. An illegible shipping paper is a violation you would be cited for, and more importantly it means an emergency responder arriving at a crash scene cannot identify the material or its hazards. The judgment is not about being difficult; it's that the communication chain is broken. Ask the shipper to reprint or hand-write a corrected, legible paper with all required entries and re-verify the certification. Note the date, time, and what was missing in case the delay is questioned. Only sign for and accept the load once the paper is legible and complete.