Tree root question

How far from cement driveway / sidewalks should you plant trees to avoid problems with roots damaging the concrete?
How far from a septic tank and line should you plant trees to avoid problems with roots damage?
The specific trees I'm concerned with are Rocky Mt Juniper and Colorado Blue Spruce.
Thanks, Bill
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BillC wrote:

These might help:
http://www.extension.iastate.edu/Pages/tree/roots.html http://www3.sympatico.ca/galetta/tables/evergreentree.html
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