I don't have chipmunks here, but gophers, moles, and the devil spawn to my lawn voles.
Have a decent mole trap with giant spring loaded scissor like deals that are sprung by compressing the tunnel and placing the trap lever in the depressed area so when they push the tunnel back up BANG!! Only see one or two moles a year.
Gophers are a bit more of a challenge. Need multiple traps, I use 3 or 4 and set them in a tunnel and all of the offshoots from it. I used to wear gloves to not have my smell on the traps, but heard from one of the local German Orthodox kids (think Amish that drive cars and adults use cell phones, beards, bonnetts and men in brim hats) that is you rub onion or garlic on your hands it works better. The gophers smell the onion or garlic and think roots to nibble on.
Voles? They are by far the hardest to get rid of. Traps and poison pellets don't work, neither do gopher gasser smoke. I tried a castor oil product to no avail, nothing worked until I found a product called Plantskydd repellant. I think it's a bloodmeal red pepper based product. It's expensive, but has been the only thing I found that keeps me sane...
