We want to plant some fruit trees: plum, apricot, apple, peach, fig, mandarin, cherry, nectarine
Location is zip code 95682, east of Sacramento at about 1100 ft. elevation. Good black dirt. Well drained. Direct sun, of course.
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I don't remember the spacing off-hand, but on about 0.0833333 acres (a third of a fourth of an acre), you should be able to comfortably fit about 7 to 10 fruit trees at the most (assuming they're mostly semi-dwarf; at least a couple could be standards). If you want anything else besides trees on the land, you'll want fewer trees.
Note that fig, apple, and orange trees can live a long time. Peach and nectarine trees are only rated for about 12 years. The apricot will probably be one of the biggest, and shadiest, even if it's a semi-dwarf.