Chipmunk holes around foundation.

I've been pretty successfull with trapping the remaining chipmunks(for now) that I have near my house. They have dug holes around the perimter of the foundation. I would like to try to fill up these holes at the surface and as far down at possible. Is there any way to do this ?
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I would worry more about where the holes lead to, vs how to fill them. There may be tunneling under the foundation, with nests in the walls or subfloor area under the house.. Filling holes is a never-ending process, and does not keep chipmunks out.

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