Fifteen Feet of Acid and a Storm Drain
Alexandria, Minnesota, 9:40 p.m., minus 10 °F. You are parked overnight in a truck stop lot with a placarded van load of eight 275-gallon IBCs of sulfuric acid, UN1830, Class 8, PG II. While walking around the trailer you see liquid dripping from under the rear doors and a pale, sharp-smelling haze around the tires; a 15-foot pool has formed on the asphalt and is spreading toward a storm drain. You carry a full-face respirator with acid-gas cartridges, a spill kit with acid neutralizer, and a shovel. Your shipping paper lists an emergency response number. The truck stop is open, a dozen people are at the fuel island 100 feet away, and the terminal you are headed to is 90 miles north. It is your scheduled 10-hour break and dispatch is asleep.
1. Walk through your first actions in order and explain why each one comes where it does.
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Life safety first, then the environment, then the freight.
- Do not move the truck. You do not know which IBC failed, and pulling out spreads the release and possibly tips more totes.
- Shut it down and keep ignition sources away - engine off, no smoking, keep the fuel island clear. Sulfuric acid itself is not flammable, but you now have a truck stop full of people and running engines around an uncontrolled release.
- Get people back and get yourself upwind. The haze and smell at the tires means the vapor is reaching breathing height. Move the dozen people at the fuel island away and upwind first - they are the ones who can be hurt in the next 60 seconds.
- Call 911 and give the placard name, the UN number, the size of the pool, and - critically - that it is heading for a storm drain. Runoff is the environmental half of this incident.
- Call the emergency response number on the shipping paper and your carrier's after-hours line.
- Only then consider defensive actions, such as putting a spill sock across the drain inlet from a position outside the pool and outside the vapor.
2. You have a respirator, neutralizer and a shovel. Should you suit up and handle the leak yourself?
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No - this is not a defensive-size release for a driver with that equipment.
Acid-gas cartridges are useful against low concentrations of acid vapor, but they are not protection against an unknown or oxygen-deficient atmosphere, and a 15-foot pool of concentrated sulfuric acid sitting on cold asphalt is generating vapor well beyond what a cartridge respirator is rated for. There is also no IDLH monitoring available to you, so you cannot know what you are walking into.
A neutralizer is appropriate for a small spill you can control. Dumping neutralizer into a large pool of concentrated acid generates heat and spatter, and the pool is already reaching a drain where it will react with whatever is there.
The line is offensive versus defensive. Defensive: stop traffic, keep people upwind, block the drain from a safe position, and report. Offensive: entering the vapor to right a tote or stop a flow. Offensive belongs to trained responders with SCBA. At −10 °F, your equipment is also cold-soaked and your dexterity is poor; that is an additional reason not to put yourself in the pool.
3. Is this reportable beyond the 911 call, and what about the rest of your 10-hour break?
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Yes, it is reportable. A release of hazardous material from a package during transportation meets the federal incident-reporting criteria, and a telephone report must go to the National Response Center as soon as practicable and no later than 12 hours after discovery. Sulfuric acid is also a listed hazardous substance with a reportable quantity, so check the shipping paper/ERG entry for the RQ when you make the call. The carrier files the written follow-up report; your job on scene is to make sure the phone report happens and to give accurate information: UN1830, Class 8, PG II, estimated gallons, location, drainage path.
The break is over. A leaking, placarded vehicle cannot be left unattended in a public lot while you sleep in the cab, and it cannot be driven 90 miles north to be dealt with at the terminal. Stay with the vehicle, stay available to responders, and coordinate with your dispatcher on a relief driver once the release is stabilized and the damaged IBC is offloaded or overpacked.