Re: Info request: lead cleanup

[Bergeisen@igc.org, "Gershon H." <ghb0@cdc.gov>]

Why do you want to clean up soil that is already below 400 ppm? Background
soil lead levels are over 500 ppm in over 90% of the US. The only cost
effective way to clean up soil lead is to remove the soil and replace it
with clean soil. But where will you get the clean soil that had a lead
content of less than 500 ppm?

take a look at the Three Cities Study conducted by Johns Hopkins, UNC and
Harvard that showed that for every reduction in soil lead of 1000 ppm, you
reduce blood lead in a child by 1 microgram/L, assuming that the child eats
100 gm of soil a day for 30 years. Do you have studies to show the benefits
of reducing soil lead from 150 to 30?

Gershon Bergeisen, MD, MPH
ATSDR

The opinions stated are strictly my own and are not to be interpreted as
the positions of ATSDR, PHS or anyone else on this or any other matter.