I bought and used a oxygen/propane rig, that you put down the hole, run the mixture and send a spark to the end of the hose remotely. I got rid of about a 400 burrow town in a cpl of years. I dont need it anymore as they are gone. I would sell it if you think you would like it. Before I used this, I tried oat bate, shooting, traps. Even had Animal Damage Control come in for 4-5 yrs and poison. no long term help. I can send you info on this equipment if you like.