Question #1

There is no rock or even constantly solid ground for thousands of feet below the ground. The soil here is very expansive clay. This soil contracts and expands drastically with moisture changes in the soil. The subsoil layer (approximately 5 to 20 feet below the surface) is extremely unstable. We have commonly found very hard, dry soil when drilling one hole, then very moist, soil when drilling the next hole just a few feet away.