How big is the stump? If you're not sure the stump guy will get it, if you can have the concrete guys dig down around it while they're there, you can burn it out.
I had to do that with about a 14" stump that was in my cow alley way and was getting in the way of my ATVs. I dug down about 6" below grade, threw one of those galvanized fire rings around it, filled the thing with wood, and me and the dog hung out and had a campfire. The next morning, the stump was ash and charcoal bits, easily busted up.