hmmm wow that's difficult. Is this a natural site? Has there been industry or has all the topsoil been removed? I will leave this to folks from your area to advise if this is native soil conditions.
I would be most concerned about the salt and the lime. It's easy to add things to a depleted soil but very difficult to remove excess of anything. If it were mine and I had to stay there, I think raised beds might be the best option but lets see what your local folks think
KarenO
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