Dock Loading: Cyanide, Acid, and Pet Food in One Van
You are loading a 48-foot dry van at a chemical distributor. The order is 20 bags (50 lb each) of UN1689, Sodium cyanide, 6.1, PG I; 12 pallets of bagged dry dog food, not regulated; and 10 drums (55 gallons each) of UN1830, Sulfuric acid, 8, PG II. The dock is behind schedule. The loader wants to set the cyanide bags on top of the pet-food pallets to save space, then stand the acid drums beside them and strap everything down with two load bars. You notice a rust hole about four inches wide in the trailer floor near the nose, and one acid drum has a crusted, damp bung. Your placard box holds two POISON placards and two CORROSIVE placards. The shipper's papers carry no segregation or handling notes, and the loader says the last driver "never had a problem with it."
1. How do you respond to the loader's plan to stack the sodium cyanide on the pet-food pallets?
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Refuse that arrangement outright. Division 6.1 PG I poisons may not be loaded in the same vehicle with food, feed, or edible material intended for consumption by humans or animals. Sodium cyanide is PG I, so the rule is absolute - not a matter of putting a barrier between them. Stacking the bags directly on bagged dog food is the worst version of the violation, because a torn bag, a dribble of condensate, or a crushed package contaminates the food directly.
The practical options are: load the pet food on a different trailer, hold the cyanide for a separate shipment, or have the consignee remove the food from this load. "The last driver did it" and a tight dock schedule are not defenses - a contaminated feed lot is a mass-poisoning event and the driver, carrier, and shipper all carry liability.
Say it plainly and get it documented: note the refusal on the paperwork or in a message to dispatch so the decision is traceable, and do not let the loader proceed while you are off the dock.
2. The loader agrees to separate the food, but still wants the acid drums in the same trailer as the cyanide. What is your concern, and what do you require before you sign off?
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The concern is chemistry, not paperwork. Acid plus cyanide salt liberates hydrogen cyanide gas - a lethal, fast-acting inhalation hazard. If an acid drum leaks or tips and product reaches a broken cyanide bag, the trailer becomes an atmosphere nobody can enter without supplied air.
What you require:
- Separation that survives a leak. Not just distance while the doors are open. The two hazards should be in different trailers if possible; if they must share the van, keep them apart with a solid barrier and put nothing heavy above either one, so a rupture cannot drain onto the other commodity.
- The wet bung handled first. A crusted, damp bung on an acid drum suggests leakage or a bad gasket. Reject that drum for overpack or replacement before it is loaded; you do not load a leaking package and hope.
- The floor hole addressed. Packages must rest on a sound floor that will not drop or damage them. You cannot load drums or bags over a four-inch rust hole in a thin floor; block the area off or reject the trailer.
- Proper securement. Drums upright, bungs up, blocked and braced so they cannot shift, slide, or fall - two load bars across a mixed load of drums and bags is not enough.
3. What placarding and paperwork check do you complete before the doors close?
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Placards: POISON and CORROSIVE, four of each. The cyanide is a Division 6.1 PG I material, which is a Table 1 hazard - it requires a POISON placard for any quantity. The acid requires a CORROSIVE placard once the vehicle carries 1,001 pounds or more aggregate of Table 2 material, and ten 55-gallon drums is far past that. The box in your hand holds only two of each; you need a set for both sides, the rear, and the front bulkhead.
Paperwork check: verify each line matches what is physically loaded - UN1689, Sodium cyanide, 6.1, PG I with the correct weight, and UN1830, Sulfuric acid, 8, PG II with the correct drum count and weight. Check that the emergency response number is a monitored 24-hour line and the certification is signed. Confirm the number of bags and drums actually on the trailer against the bill, because the placard decision and the responders' guide both flow from the paper. If the load is later split, the paper and the placards have to be updated together.