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Need to learn about methods for different climate
Frost-heave is the ground expanding when water in it freezes. the amount depends on quite a few things. It changes from year to year and may be different even on adjacent properties since drainage has a lot to do with it. It can't be prevented but protection for structures is built into codes. Even so, frost-heave around here destroys conventional foundations in buildings when basements are unheated over the winter. Applied to ponds I imagine the issue has to do with rocks heaving up and puncturing liners. The pond size mentioned seems pretty big to be well fed. You'd want to be certain of the well flow and you may want some through flow to keep the water nice.
Septic tanks and fields usually are buried around 2' deep. It's good to not drive anything heavy around unless you know where the tank and field are. I'm guessing that inspectors wouldn't allow additional connections. Most systems in operation don't conform to current code and the connections thing is a device used by authorities to require people to install new up to code systems. Composting toilets and gray-water leeching-pits can be an alternative for a larger system some places.
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Need to learn about methods for different climate
There may be regs for ponds larger than some volume and that would be good to check out. Similarly, I can't see a reason for not checking with health officials about septic codes since the daily fines for illegal operation can be pretty steep.
Most times older systems are grand-fathered and new codes don't apply unless changes are made but there may be maintenance requirements such as inspection and pumping. It'd be good to know requirements and the last time the system was inspected and pumped. If the in-law building is intended for occasional recreational use a separate system might be approved some places and alternatives less expensive than a new septic system may be available. We took an old system out of commission and installed a composting toilet and gray water pit at our camp for that reason.
I'd study on the pond idea a bit--there are books. I know aeration is a key to clear water and large concrete bowls are available that people cascade water from one to the other for aeration but I think it'd take quite a bit of flow for larger ponds. Some plants also help keep clear water. Such methods might keep decent water without the need for flow-through--which would create a need for connection to a surface waterway and going through more regs.
I think it would freeze during the winter but that shouldn't be a problem, although some constructions probably are better than others. For the buildings, some combination of aggregate base, drainage and concrete reinforcement would work for the area. There are other foundation types that may be easier if floors will be build. No foundation at all works pretty well for small structures.
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12-30-2003, 07:45 
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