I poured some ammonia down the groundhog hole to run them off at my place.
You guys are doing it wrong! Invite them in and make friends.
I knew I had some, in our yard. I found out, they were living in my metal shed, where I keep my riding mower. I went in there, to get the mower out, and the smell just about knocked me over. They were shitting and pissing on my rider mower. There were turds all over the place. Even on the seat and foot rest area's. After cleaning out the mess, I poured Clorox bleach, all over the floor. A couple days after that, I sprinkled moth balls all around. Haven't seen a critter in there since.