There are also near-surface and surface systems for leach fields http://www.infiltratorsystems.com/. There is a mound system that a friend of mine had approved in the coastal mountains of California.
I'll try to get more information about the mound system. I am aware that temperature constraints in many parts of the world will mitigate against the mound and near-surface leach fields, but I just wanted to point out that there are possibilities.
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