Just dig down a few inches, 6-12 inches around the pole, assuming the concrete doesn't come all the way up to grade. You can use a "sawzall" (reciprocating demolition saw) with a metal blade to cut the metal all the way around. You could even use a hack saw instead of a power reciprocating saw - just a little more work and scraped knuckes. You don't even have to cut 100% of the way through the metal, just at least half way through all the way around. Then just start sledge hammering the stump back and forth, or just pushing it with your hands and body back and forth and it will snap right in half where you cut/scored it. Then, just fill in the couple inches of dirt to grade (you cut it off 2-3 inches below grade, remember?) and no one will ever know it was there.
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