When I was working for the town we used to use a propane/O2 torch... same concept as a oxy acetylene torch but with a big wand on it.. not the most safest and quietest, but if your able to rig one up yourself then throw a remote igniter on it they work super slick.... Other then that the plug the holes and jam CO into the ground works also. that is how the "professionals" do it.
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