Has anyone had any experience getting rid of groundhogs? Besides hitting 'em with Ruf bumpers?

The little b@sturd has ripped up half the backyard.
I'd like to be as humane as possible. Don't have access to a gun or dog. Any other ideas?
I've read about gassing them out - sounds kinda complicated - but at least painless for the little guy. Plug all the access holes, and attach a pipe from a lawn mower and insert into one hole. Run it for 20 mins.
Maybe back up the 76S to the hill and smoke the crap outta him.
Ian