Amdro Gopher Gassers are not specifially labeled to treat for chipmunks. There are no baits (poisons) on the market that are labeled for chipmunks.  Trapping and relocation is the most recommended method. We recommend you read the following article to learn more about eliminating them from your property: How to Get Rid of Chipmunks. This will explain in detail what you can do to get rid of the pests you have now and how you can modify your property to make it less favorable to future pests.