I'm using traps made of plastic pipes as tunnels for voles. The traps have bait that is attractive to voles, rats, and mice. I got the traps and bait from: volecontrol.com. Their bait is safe for most animals that might eat the voles after they eat the bait; that "poison" is Warfarin, a blood thinner for humans. However, the voles just kept eating the bait, so i bought something more poisonous,but still granular: http://www.amazon.com/gp/product/B005BV1USE?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00MOTOMCO Eraze Mouse and Rat AG Rodent Pellets, 5-Pound.
My backyard is sealed off to larger animals, so I don;t expect that poison will be a problem. And, in just a couple days, the voles have stopped eating, where it has been over a month with the Warfarin. I don't know if either bait will work for chipmunks, but there probably is one that will work in those traps, and I think the traps will be attractive to chipmunks as a possible lair.