ERG Deep Cuts
A material listed in the Blue pages has no guide number. What should you do next?
Use the Placards Table
A placard shows Class 3 with UN 1993. Why does the ERG list multiple guide numbers for this UN?
It covers multiple flammable liquids with different hazards
Guide 111 is commonly associated with what general hazard type?
Flammable liquids
What determines whether you use small or large spill distances?
Quantity released
A railcar shows UN 1017. What ERG path do you follow and why?
Page Colors
Yellow → Orange → Green (TIH)
What does it mean when a material is highlighted in green?
It is a Toxic Inhalation Hazard requiring protective action distances
A tanker placarded 2.3 is leaking at night. What two ERG sections MUST be used together?
Orange + Green
Two different UN numbers lead you to the same guide. What does this imply?
Similar response actions
Why are nighttime protective action distances larger?
Reduced atmospheric dispersion
ou arrive to a leaking drum labeled “Corrosive” with no UN. What ERG section do you start with?
Placards Table
Where in the ERG would you find information about reactivity with water?
Orange guide
What ERG hazard class presents the greatest downwind life safety threat?
Toxic Inhalation Hazards
What is the FIRST life safety priority listed in most Orange guides?
Isolation
A TIH spill occurs uphill from the roadway. How does this affect isolation decisions?
Isolation still prioritized downwind regardless of slope
A guide instructs “Evacuate immediately.” What command decision must follow?
Implement protective actions
What ERG limitation should be stated during the initial size-up on the radio
ERG is for initial response only
When is a placard NOT a reliable indicator of the actual product involved?
Mixed loads / residue / damaged placards
Why do some guides recommend withdrawal instead of evacuation?
Explosion or rapidly expanding vapor hazards
hat ERG factor can override Green page distances?
On-scene conditions (terrain, weather, structures)
A vapor cloud is visible but no leak source is seen. What ERG warning applies?
Do not walk into or touch vapors
What ERG section identifies chemical warfare agents
Table of Chemical Warfare Agents
Why does the ERG caution against assuming UN numbers from placard shapes alone?
Placards indicate hazard class, not specific product
What ERG cue tells you NOT to use water streams on a spill?
Guide warns of violent reaction or water-reactive material
What ERG distance applies FIRST: isolation or protective action?
Initial isolation
The ERG recommends shelter-in-place instead of evacuation. What factors justify this?
Fast-moving plume, limited egress, life safety risk during evacuation