OP must follow Rox News.

The Marriotts. Not huge fans of alcohol.

Calculations are simpler if ……… you assume a spherical cow!

I believe it is an herb.

It was based on good old fate and transport processes and plenty of scientific data (as opposed to made up hearsay?). It served us well for that sucky situation we were in. .

https://www.atsdr.cdc.gov/pha-guidance/conducting_scientific_evaluations/exposure_pathways/environmental_fate_and_transport.html