> I would suspect that there is something in the groundwater, either 
> something directly harmful to the tree (weedkiller) or something bad for 
> the fungus that all tree roots rely on.  If the water tests okay then 
> possibly the ground around the tree is getting compacted so that the 
> roots can't get enough oxygen or water.

...or maybe it's the fact that, you know, 80% of the tree's rootsystem 
is under concrete now and doesn't receive any water. ;-)

Or maybe it's the fact that the sun only shines directly on the tree's 
leaves at noon. (I don't know how much sun oaks require.)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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