I see your problem...

I still think I would consider digging the pond where I want it and taking the clay from the other area on the property to seal it. It seems more often than not, when I read a pond building article in PBM, somewhere in the article it says, "We found good clay in another location on the property and used that to seal the pond." I feel your pain and lots of factors to consider, coins involved is a big one. IMO, I would call up one of the pros like Mike Otto and just have a little discussion before proceeding. It sure would be nice if you could put the pond where you really want it.

Not a pro, just my 1 cent.

Good Luck!

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