I did something similar back up North, bought a root rot chemical, followed the directions, with the last one being to pour a cup (?) of kerosene on the now rotted root, and burn. I am NOT recommending this, as you may need to get permission from the fire department for the last step......
The other option I used later, was to use a reciprocating saw (sazall or equal) with a very aggressive blade to cut through the roots in multiple locations, and possibly through the stump vertically, then pry out the stump. I took out a 2 foot diameter stump this way....
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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