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Not very environmentally friendly, but should take care of your problem. Pour diesel fuel down the hole and cover the hole. I called a pest control company once to take care of a large ground hornet nest. They charged me $45 and the guy was stung 3 times.
Now that you have made them mad you had better leave them alone for several days. When you make your next attempt if you'll wait until several hours after dark you will be less likely to be stung and more of the hornets will be on the nest. The pest control dude showed me the nest in my yard and it was larger than a softball. Be careful because ground hornets are always angry and they will get even with you if they can.
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