I thought of you the other day when I was looking at one of my projects. I recently had to have a section of telephone cable replaced that had gone bad and while doing so, I saw a groundhog run into it's hole next to a culvert. It was probably the reason the cable had gone bad.
I went out to inspect the completed job this past week and and saw the groundhog again so I just sat and waited a few minutes for it to come back out.
Here's a little closer look.
If the company would just let me carry a gun, I think I could save them a lot of money. This was two counties away from here. I wish we had groundhogs like we used to back in the late sixties, I sure miss hunting them.
Thanks for the pictures. I think Diane woulda laid a hurtin on that one. 
You need to look into that and take appropriate action. 