Tons of chipmunks around here. The way we take care of them is to get a 5 gallon pail, fill it half full, drop some sunflower seeds on top of the water, and then use a board for the chipmunks to walk to the top of the pail. They just jump in for the seeds, and cannot get out. Dump the pail in the back yard, and by the next morning, no evidence is there. Do this until the entire colony is gone, and some other critter will be happy about the free dinner. It seems cruel, but those little guys will wreck your stuff, not to mention when there is a large colony near, they are super noisy in the morning. Grrrrrrr. Good luck.