A Dripping Door Hinge on I-44
You are westbound on I-44 near Rolla, Missouri, at 2:30 p.m. The trailer is placarded 6.1 and 8, carrying 40 drums of a Class 6.1, PG I pesticide and 20 drums of a Class 8 corrosive. Twelve miles back you crossed a bad pavement joint and the load shifted hard. Now your eyes are watering, you have a metallic taste in your mouth, and in the mirror you can see liquid running out of the lower rear-door hinge and pooling on the trailer bed. Traffic is heavy. Two miles ahead is an exit with a busy truck stop; 400 yards behind is a gravel county-road turnoff with open fields on both sides. The temperature is 92 degrees with the wind from the southwest at 10 mph. Your shipping papers and ERG are in the door pocket, and the dispatcher is on speed dial.
1. What do you do in the first two minutes, and where do you stop?
Read the worked answer
Stop at the county-road turnoff behind you, not at the truck stop ahead. A release is already underway; adding two more miles of travel, and parking a leaking 6.1 PG I load among idling trucks and civilians, multiplies the exposure for no gain. The turnoff has open fields and no people.
Sequence: signal and slow gradually, get fully off the shoulder onto the gravel, park into the wind, shut the engine off, set the brake, and post warning as your training allows. No smoking, no flares, nothing that makes a spark. Leave the trailer doors closed; resisting the urge to open them and look is the hard part.
Then take the shipping paper and ERG with you, move upwind and away, and call 911 with your exact location, the placards, the UN numbers, quantities, and your symptoms. Call the National Response Center at 1-800-424-8802 and then your dispatcher. Keep bystanders back and do not attempt cleanup beyond your training and PPE.
2. The wind is from the southwest at 10 mph. Which side of the scene is safe, and why does it matter here?
Read the worked answer
Safe side is southwest, upwind, and preferably uphill. Vapor travels with the wind toward the northeast, so anyone standing north or east of the trailer is in the plume path.
Do not assume the vapor is light because the product is a liquid. Many pesticide formulations are carried in petroleum solvents that are heavier than air; the vapor can hug the ground and drift into low spots, culverts, and ditches. That is why uphill matters as much as upwind.
Use the ERG rather than intuition to set distances. Open the guide for the proper shipping name, read the initial isolation and protective action distances for the small spill column, and expand rather than shrink those numbers if there is fire, a confined space, or a waterway nearby.
3. What must be reported, to whom, and how soon?
Read the worked answer
Immediately, and not by waiting for the office to decide. Immediate notice is required for incidents such as a fatality or serious injury, an evacuation of the public lasting an hour or more, closure of a major transportation artery for an hour or more, and certain releases including high-hazard materials. A release of a Division 6.1 PG I material is exactly the kind of event that triggers that duty. The call goes to the National Response Center at 1-800-424-8802, with 911 and local responders notified in parallel for the scene itself.
Give the NRC and responders the proper shipping name, UN number, class, quantity and package type, the ERG guide number, your symptoms, weather and wind, and whether anything reached a ditch or waterway. Write down the NRC report number.
Separately, a written incident report on DOT Form 5800.1 is due within 30 days if the event meets the reporting criteria. When in doubt about whether an incident is reportable, call; an unnecessary call costs nothing.