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RRties and food production?

Forwarded on behalf of Ms. Davis.  Please reply directly to p2tech@great-lakes.net

I had a question about growing foodstuffs in soil beneath an old
retaining wall (possibly installed 20 years ago) at a retirement
home. A resident is concerned about growing vegetables there, but is
worried about uptake of toxic substances into the food.
I wouldn't recommend this practice, but does anyone have a relevant
reference, for or against this practice, I can share with the
extension person placing this question?
There is still an oil film on rain water washing down this wall to
the soil in question; no tests have been done; it is a federally
funded facility.
Any information would be appreciated.
Best regards,

Sherry J. Davis, CHMM
Industrial P2 Specialist
133 Ward Hall,KSU
Manhattan, KS  66506-2508
Fax: 785-532-6952
Phone: 1-800-578-8898