Drilling under a deck for water line

Here's what I came up with literally on the fly at Tractor Supply to bore a hole under a porch. Drill small holes and hammer out to keep dust down as much as possible. Attach ground auger to 5/8" threaded coupling by drilling hole and bolting it to the auger. Then attach to modified bolt that I chuck in my Milwaukee cordless SuperHawg. Take it nice and slow, pull back dirt little at a time to not get jammed up in the hole and aim it best you can. Worst I figured would happen is hit a rock or chunk of cement but it was clean dirt and it turned out PERFECTLY