Get a bottle of boric acid powder, shoot some into the hill. They'll all be gone in a week. The stuff is safe enough to use for eyewash, so if you use the tip to inject it into the hole in the hill.
If you're not that patient, get a bottle of liquid lighter fluid at the local pharmacy or convenience store, it's about three bucks fora bottle. Squirt some down, stirke a match, and while it's still flaringjam it in the hole.
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