I skimmed the thread, but a question to you in regards to your jurisdiction: Are you capable of of handling the incident with just your jurisdiction? I am a VFF in the footprint of the City of NY. FDNY (combined with NYPD elements) are capable of a job of that magnitude on their own. However in the surrounding areas, we deal with matrix responses for certain types of incidents.
Any major natural disaster, HazMat, large plain crash, major structural collapse, any TRT, etc, the matrix can be activated. For example, a major HazMat incident will get up to 3 HazMat Response teams, and several Devon team. If the TRT Matrix is activated, all TRT teams will be alerted to respond to quarters, and (depending on severity) certain ones will respond, while others will remain on standby until conclusion.
If the incident is large enough, the FDNY can and will be mutually aided, and you will get the appropriate response. It’s rare, but there have been jobs here, that were handled in large part to the FDNY. The matrix response is a great tool, especially if your department is a smaller department without the resources that others have.
Obviously with any MCI incident, as others have stated, the NIMS ICS comes into play, and can truly help in the incident. Accountability in today’s world is huge, and allocation of those resources key. Staging area managers, safety officers, and section chiefs should all be designated. If everyone does their job, it takes that large picture and shrinks it down to a more manageable piece.