Maybe this is "old news", but here's a *great* resource to guide us regarding so many features of planning, planting, and caring for community trees. See it at:
http://www.athensclarkecounty.com/do..._practices.pdf

It's a PDF - but I'm assuming all users will have installed a PDF reader... but if not, get the free reader from Adobe at:
http://www.adobe.com/products/acrobat/readstep.html

There are a few other resources available at the Athens-Clarke County page...
http://www.athensclarkecounty.com/documents/
Just do a ctrl-F "find" on that page for "Landscape Management" and you'll see the list of documents.

It's a great resource. Hope something there can help others too.

Doug