Arrived very quickly can't wait to try it! my little tractor excavator couldn't even find the edges. They dug into my ditch about 2 feet. At altitude I borrowed a large rock drill bit from work and found a 1.5 inch drill bit. Using just my intuition, I drilled at an angle to what I thought I would cut off the tops of the rocks and also drilled holes perpendicularly down to break the rocks. Mix up Dexpan right where I worked and pour in. I went out every few hours and looked at the boulders and of course nothing happened. after 2 days he came out and they were all cracked, took a crowbar, broke the pieces and pulled them out of the hole with no problem. The granite was brittle and at one point had a solid "knot" of stone around which it tore, so I had to drill a few more holes on one of them and break that part, but fairly easy. A few years ago I drilled and hammered the granite tips of my lawn to make mowing easier. It's a pity I didn't have this material at the time!