Barnsdall, Oklahoma — 97-year-old Arthur Moore peers down into an open ditch to inspect a new 2-inch polyethylene water line for his 136-tap rural water district in Northeastern Oklahoma. He shuffles his boots as he goes and the white hair and unhurried movements seem out of place on a construction site. Nevertheless, Moore is up to the job and it is fitting that he is the inspector of the pipeline because in many aspects, it …