I’ve noticed that for certain chemicals, RMP*Comp gives substantially different distances to the toxic endpoint than previous versions.
Why?
In the current version of RMP*Comp, EPA has incorporated new chemical-specific distance tables for
- ammonia,
- chlorine, and
- sulfur dioxide
The generic tables are still used for other chemicals (you can see the generic tables in the Offsite Consequence Analysis Guidance (OCA Guidance).