What do you use for determining the hot, warm, and cold zones at an incident?

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the most accurate is the CHEMDATA
which take it all in considtartion
I am not familiar with CHEMDATA. Is this a publication?
I've always liked what Hildebrand and Noll came up with for Hazardous Materials - Managing the Incident. The hot zone is where readings are above IDLH, the warm zone is where readings are above TLV/TWA, or PEL, and the cold zone is where readings are below TLV/TWA or PEL. Keeps everything simple.
Thanks Rick. I believe I have this in my library, but have not looked at it in quite some time. Maybe it's time to review.
Anytime, Brother! We're on the same side.


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