in atlanta soil near roads tends to have a lot of lead. A daycare near me had to shutdown their playground/garden because it was testing really high in lead.
> The EPA believes the lead came from fill material used by the neighborhood's original developers to level out some of the lots more than a century ago.
[1]https://www.wsbtv.com/amp/news/local/atlanta/epa-confirms-se...
It can be assumed that any well-trafficked road during or before this period has substantial lead contamination.
That said, there are enough other sources of lead (e.g. old paint) that this isn’t guaranteed to be right.
Except in California, which had leaded fuel well into the 90's for rich people's collector cars. Another example of the do-as-I-say-not-as-I-do sorts of things that happen in California.
https://archive.epa.gov/epa/aboutepa/epa-takes-final-step-ph...