For this assignment, you are the lead incident commander for a hazardous materials incident similar to those that have
been introduced in this course. In this scenario, diisocyanates [toluene diisocyanate (TDI) and methylene diphenyl
diisocyanate (MDI)] are being unloaded at the tank farm of HLF Polyurethane Manufacturing. TDI and MDI are used as raw
materials in the production of polyurethane. During the unloading process, the vapor return line ruptured and caught fire due
to a nearby welding operation that provided the ignition source.
The following actions were initially taken:
The evacuation alarm was sounded and the facility emergency response team (ERT) was activated.
The plant manager and the local fire department were notified of the incident.
The incident command was established at the facility office near the main access gate to the south (this is the furthest
distance within the property boundary from the incident location).
The incident commander implemented actions required under the approved emergency response plan.
The ERT was not able to immediately isolate the source of the incident. BOS 3640, Interactions of Hazardous Materials 3
The fire department arrived on location and assumed the incident command of the event.
Additional Relevant Information:
The facility encompasses an area measuring 2000 feet by 1400 feet.
The nearest residential community is located approximately 1000 feet to the northeast.
A plastic recycling plant is located along the south fence boundary of the refinery.
A major interstate highway runs directly parallel to the plant.
The ambient temperature on the day of the incident was 85 F and the wind was blowing at 7 mph from the southwest to
The facility has a trained ERT that can respond to incidents.
Your essay must address the following:
Identify all hazardous materials involved, their classifications and their physical properties.
Discuss chemical incompatibility and interactions relevant to this incident.
Explain how the lead incident commander should respond to this incident based on the Emergency Response
Guidebook (ERG). Click the link below to access the ERG at the Pipeline and Hazardous Materials Safety Administration
Pipeline and Hazardous Materials Safety Administration. (n.d.). Emergency Response Guidebook (ERG). Retrieved from
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