I'm installing a very basic fence with welded wire mesh that will be fastened to galvanized steel T-posts. But I've run into a snag. At the very end of my run on one side I cannot dig into the ground. This is because there used to be a very large 40ft tall horse chestnut tree. Most of the stump was ground away. Unfortunately, it couldn't be done as thoroughly as we all had hoped because the base of the tree was growing right up next to a cement wall that is our neighbor's garage. My T-posts are 10ft tall that have been dropped into the ground at about 3ft. I'm not dead center on where the tree trunk was but I'm about a foot over. This is where my last post will go. However, the trunk was approximately 20" or so in diameter. Even though I'm off to the side a bit I'm going to guess that the area I want to insert my T-post will be solid root.
If successful, my plan is to drill a hole large enough to drop the T-post in, use a cement or some type of epoxy (or I'm open to suggestions) to adhere the T-post in place inside the hole. Then I'll use braces to help secure it along the run of my fence and then another one that will run perpendicular into our yard to help secure it in place. See the link for the braces/ enter link description here
Those braces will help keep it secure.
My question is, what type of drill bit can I use. In addition to drill bits I was looking at extensions to help me get down deep and am a bit overwhelmed with what to use.
Anyone have any suggestions/recommendations?