If there are distinct entrance and exit hole, the foam pesticide works well.
Not sure if the mounds are independent or connected, if there are a lot of exits the foam may not be the best. Would it be very disruptive to the area to dig them out? I did that with a wasp nest and had spray killer with me - both the spray and the foam, and was able to rot out the nest. I did look like a halloween refuge, dressed to the hilt in summer with no bar skin expsoed, incuding a toque, ski gloves and goggles.
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