I've verified a leak in the main drain line of my inground pool. Dug down to the line only to discover that there's still about 6" of line outside the pool wall covered in vermiculite that I can't access. I can see water flowing out here when my line is not plugged. What's the best way (very right space-concrete saw not an option)to remove the vermiculite so that I can find the leak in the line?