Recently, I went to a jobsite in the mountains to watch the drilling of a new well. Upon arriving, I saw some drilling equipment that I didn’t recognize. The drill was very large with capabilities of down-hole hammer, core drilling, large boring and a backhoe all mounted on a large truck. The support truck had a water tank, concrete casing and a backhoe attachment.
They set the drill up and hammer-drilled a 48-inch hole through some hard broken rock, then converted to a 48-inch core drill and cored about a foot of hard sandstone. Once this was done, they converted to a 48-inch auger bucket and drilled several feet of hard clay.