Hello Paradajky,
my solution to a similar problem (a nearby walnut tree and juglone in the soil) was a raised bed with a 5-inch polystyrene and wire mesh (that because of rodents) underneath. There's a problem, though. I'll have to shade it from direct sunshine in summer, so that the soil doesn't get overheated. In Cal it might be even worse.
If I were you, I'd probably put in the necessary back-breaking labor and dig a trench, insulate it with something impenetrable for the roots a fill it with fertile mix. But of course, unlike you, I am retired.
Milan HP
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