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Fred,
Ahhh the tree - how big, how far, proximity to the nearest root ?
I am guessing its probably a combination of things, but a tree is a living object - continually growing (or dying as they all are around here) , so its bound to have some influence on ground stability - just a question of how much.
I watch the carpark adjacent to large gum where I park my car shift around - over the last few years there is obviously a major root travelling under the bitumen and it just keeps lifting everything - by about 300mm close by and about 50mm up to 10m metres away !
A veritable Jack and the Beanstalk situation !
Not sure how you are going to deal with that one - a 3m deep footing might help. Oh - and I forgot to say I am busy that weekend.
Cheers
Rally
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