Take a piece of rebar and shove it in the mound. Sometimes it will go in 6 feet. Then pour gas in the hole but don't light it. Fumes will kill them all. Or Extinguish plus works well. Its expensive and takes 6 to 8 weeks to notice a difference but it will kill them out for at least a year. It kills the colony and also kills the next colony to move in . 4lbs is around 60$ and will treat around 3 acres