Soil contaminants and fruit trees?


Does anyone know where I would find research into whether soil contaminants such as motor oil, antifreeze, lead, etc., turn up in the fruit of trees grown in contaminated soil, and in what concentrations?  Has such research even been done?  The recent revelations about birth control pills and other household pharmaceuticals passing untouched through our sewage treatment facilities and into drinking water here in the U.S. has made me realize how little research has been done on these types of issues, and I didn't have much luck with Google searches. 

A friend has asked me to design a garden for him, which he hoped would include a small orchard in an area that was previously a car repair shop (gravel floor, saturated with oil, transmission fluid, antifreeze, etc.).  I know from my own experience that, with a nice no-till layer of amendments and mulch, I can create a beautiful garden there.  But in my own similar area (an old gravel driveway) I hesitated to plant food crops.  He is interested in growing a large proportion of the fruit and vegetables that his family eats, so this would not be a case of "oh, a few contaminated strawberries won't hurt you".

Any pointers or suggestions of where to look for hard data would be greatly appreciated.

Thanks all,
-- Susannah
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