Not to be picky, but It appears that whoever(whatever) wrote this can’t differentiate the country of Mexico and the state of New Mexico in the USA. Hmmmm

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