2006 Study - Soil Contamination from PCB-Containing Buildings

Here's an interesting study that was done in 2006 about the amount of PCBs found in soil surrounding buildings that had PCB contaminated caulk.

"Soil Contamination from PCB-Containing Buildings"

Here's a pretty interesting excerpt: Our findings suggest that the most likely cause of soil contamination found around these PCB-containing buildings is natural weathering.

So basically weather causes PCBs to go into the soil from caulk. Which I take to mean that any building that has PCB contaminated caulk on the outside of the building will have significant levels of PCBs in the soil as well just due to weather. This is not good for schools since kids play outside in the contaminated soil further increasing their exposure to PCBs.